/* ============================================================================
   Nurlis Memory · Obsidian-style 3-panel UI
   Dark theme, file tree + editor + backlinks.
   ============================================================================ */

:root {
  /* Obsidian-inspired dark palette */
  --bg:            #1E1E1E;
  --bg-alt:        #252525;
  --bg-panel:      #2A2A2A;
  --bg-hover:      #333333;
  --bg-active:     #3F3F3F;

  --line:          #3A3A3A;
  --line-subtle:   #2E2E2E;

  --ink:           #DCDCDC;
  --ink-2:         #B0B0B0;
  --ink-3:         #808080;
  --ink-4:         #5A5A5A;

  --accent:        #8B5CF6;       /* purple (Obsidian-ish) */
  --accent-soft:   rgba(139,92,246,0.15);
  --link:          #A78BFA;
  --link-hover:    #C4B5FD;
  --tag:           #60A5FA;
  --tag-bg:        rgba(96,165,250,0.12);

  --up:            #4ADE80;
  --warn:          #FBBF24;
  --down:          #F87171;

  --font-ui:       system-ui, -apple-system, 'Segoe UI', 'Inter', sans-serif;
  --font-mono:     ui-monospace, 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;
  --font-editor:   'iA Writer Quattro', -apple-system, system-ui, sans-serif;

  --sidebar-w:     260px;
  --backlinks-w:   280px;
  --header-h:      44px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.55;
  height: 100vh;
  overflow: hidden;
}

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

code, pre, .mono {
  font-family: var(--font-mono);
  font-size: 13px;
}

/* ─── Layout: 3-panel grid ───────────────────────────────────────────────── */
body {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: var(--header-h) 1fr auto;
  grid-template-areas:
    "header header"
    "sidebar main"
    "footer  footer";
}

/* ─── Header (thin top strip) ────────────────────────────────────────────── */
header {
  grid-area: header;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  padding: 0 16px;
  z-index: 10;
}
header .container {
  display: flex;
  align-items: center;
  width: 100%;
  gap: 20px;
  max-width: none;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.brand .logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--ink);
}
.brand .logo::before {
  content: '◈';
  color: var(--accent);
  margin-right: 6px;
  font-size: 14px;
}
.brand .logo-sub {
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}

nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
  font-size: 12px;
}
nav a {
  color: var(--ink-2);
  padding: 5px 10px;
  border-radius: 4px;
  transition: background 100ms ease;
}
nav a:hover {
  background: var(--bg-hover);
  text-decoration: none;
  color: var(--ink);
}
nav a.nav-active {
  background: var(--accent-soft);
  color: var(--link);
}

/* ─── Sidebar (file tree) ────────────────────────────────────────────────── */
.sidebar,
aside.sidebar {
  grid-area: sidebar;
  background: var(--bg-alt);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  padding: 12px 8px;
  font-size: 13px;
}
.sidebar::-webkit-scrollbar,
main::-webkit-scrollbar { width: 8px; }
.sidebar::-webkit-scrollbar-thumb,
main::-webkit-scrollbar-thumb {
  background: var(--line); border-radius: 4px;
}
.sidebar::-webkit-scrollbar-thumb:hover,
main::-webkit-scrollbar-thumb:hover { background: var(--bg-active); }

.sb-section {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding: 10px 10px 6px 10px;
  margin-top: 8px;
}
.sb-section:first-child { margin-top: 0; }

.tree-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  color: var(--ink-2);
  user-select: none;
  transition: background 80ms ease;
}
.tree-item:hover { background: var(--bg-hover); color: var(--ink); }
.tree-item.active {
  background: var(--accent-soft);
  color: var(--link);
}
.tree-item .icon {
  font-size: 13px;
  width: 16px;
  text-align: center;
  color: var(--ink-3);
  flex-shrink: 0;
}
.tree-item.folder > .icon { color: var(--warn); }
.tree-item.file   > .icon { color: var(--ink-4); }
.tree-item .label {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 13px;
}
.tree-item .count {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-4);
  background: var(--bg-panel);
  padding: 1px 6px;
  border-radius: 8px;
}
.tree-nested { padding-left: 14px; }

/* Folder collapse marker */
.tree-item.folder::before {
  content: '▸';
  font-size: 9px;
  color: var(--ink-3);
  width: 10px;
  margin-right: -2px;
  transition: transform 120ms ease;
}
.tree-item.folder.expanded::before {
  transform: rotate(90deg);
}

/* ─── Main content (center editor area) ──────────────────────────────────── */
main {
  grid-area: main;
  overflow-y: auto;
  padding: 40px 60px;
  max-width: none;
}
main .container {
  max-width: 780px;
  margin: 0 auto;
}

/* If item view, switch to 3-column with right backlinks */
body.has-backlinks {
  grid-template-columns: var(--sidebar-w) 1fr var(--backlinks-w);
  grid-template-areas:
    "header   header  header"
    "sidebar  main    backlinks"
    "footer   footer  footer";
}
aside.backlinks {
  grid-area: backlinks;
  background: var(--bg-alt);
  border-left: 1px solid var(--line);
  overflow-y: auto;
  padding: 16px 14px;
  font-size: 13px;
}
aside.backlinks h4 {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 10px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-subtle);
}
aside.backlinks h4:not(:first-child) { margin-top: 20px; }
.bl-item {
  padding: 6px 8px;
  border-radius: 4px;
  margin-bottom: 2px;
  cursor: pointer;
  color: var(--ink-2);
  transition: background 80ms ease;
}
.bl-item:hover { background: var(--bg-hover); color: var(--ink); }
.bl-item .bl-title {
  font-size: 12px;
  font-weight: 500;
}
.bl-item .bl-preview {
  font-size: 11px;
  color: var(--ink-3);
  margin-top: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

/* ─── Article body (item view — Obsidian editor feel) ────────────────────── */
article {
  font-family: var(--font-editor), var(--font-ui);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
}
article h1 {
  font-size: 28px;
  font-weight: 500;
  margin: 0 0 24px 0;
  color: var(--ink);
  letter-spacing: -0.01em;
}
article h2 {
  font-size: 21px;
  font-weight: 500;
  margin: 28px 0 12px 0;
  color: var(--ink);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line-subtle);
}
article h3 {
  font-size: 17px;
  font-weight: 500;
  margin: 20px 0 8px 0;
  color: var(--ink);
}
article p { margin: 0 0 14px 0; }
article ul, article ol { margin: 0 0 14px 24px; padding: 0; }
article li { margin: 3px 0; }
article blockquote {
  border-left: 3px solid var(--accent);
  padding: 2px 14px;
  margin: 14px 0;
  color: var(--ink-2);
  background: var(--bg-alt);
  border-radius: 0 4px 4px 0;
}
article code {
  background: var(--bg-alt);
  padding: 1px 5px;
  border-radius: 3px;
  color: #F472B6;
  font-size: 13px;
}
article pre {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  padding: 12px 16px;
  border-radius: 6px;
  overflow-x: auto;
  margin: 14px 0;
}
article pre code { background: transparent; color: var(--ink); padding: 0; }
article hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 20px 0;
}
article a { color: var(--link); border-bottom: 1px dashed var(--link); }
article a:hover { text-decoration: none; color: var(--link-hover); border-bottom-style: solid; }

/* Wikilinks [[Name]] — styled as Obsidian internal links */
.wikilink {
  color: var(--link);
  background: var(--accent-soft);
  padding: 1px 4px;
  border-radius: 3px;
  border-bottom: none;
  text-decoration: none;
  font-weight: 500;
  transition: background 100ms ease;
}
.wikilink:hover {
  background: rgba(139,92,246,0.28);
  text-decoration: none;
}
.wikilink.broken {
  color: var(--down);
  background: rgba(248,113,113,0.1);
  text-decoration: line-through;
}

/* Tags #tag */
.tag {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--tag);
  padding: 1px 7px;
  border-radius: 10px;
  font-size: 12px;
  font-family: var(--font-mono);
  margin-right: 4px;
  font-weight: 500;
  letter-spacing: 0.01em;
}
.tag:hover { filter: brightness(1.2); text-decoration: none; }

/* ─── Frontmatter block (YAML rendered as key/value panel) ───────────────── */
.frontmatter {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 12px 16px;
  margin: 0 0 24px 0;
  font-family: var(--font-mono);
  font-size: 12px;
}
.frontmatter summary {
  cursor: pointer;
  color: var(--ink-3);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 600;
}
.frontmatter table {
  margin-top: 10px;
  width: 100%;
  border-collapse: collapse;
}
.frontmatter td {
  padding: 3px 8px;
  border-bottom: 1px dashed var(--line);
  vertical-align: top;
}
.frontmatter td:first-child {
  color: var(--tag);
  width: 140px;
  white-space: nowrap;
}
.frontmatter td:last-child { color: var(--ink); }

/* ─── Home / browse / generic lists ──────────────────────────────────────── */
.hero {
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}
.hero h1 {
  font-size: 24px;
  font-weight: 500;
  margin: 0 0 6px 0;
  color: var(--ink);
}
.lede {
  font-size: 13px;
  color: var(--ink-3);
  margin: 0;
  font-family: var(--font-mono);
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
  margin-bottom: 24px;
}
.stat-card {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 14px 16px;
}
.stat-label {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 600;
  margin-bottom: 8px;
}
.stat-value {
  font-family: var(--font-mono);
  font-size: 24px;
  color: var(--ink);
  line-height: 1;
}

.list-items {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}
.list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line-subtle);
  cursor: pointer;
  transition: background 80ms ease;
}
.list-item:last-child { border-bottom: none; }
.list-item:hover { background: var(--bg-hover); }
.list-item .li-title {
  color: var(--ink);
  font-weight: 500;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.list-item .li-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  margin-left: 16px;
  flex-shrink: 0;
}

/* ─── Search ─────────────────────────────────────────────────────────────── */
.search-box {
  position: relative;
  margin-bottom: 20px;
}
.search-box input {
  width: 100%;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  color: var(--ink);
  padding: 10px 14px 10px 36px;
  border-radius: 6px;
  font-size: 14px;
  font-family: var(--font-ui);
  transition: border-color 120ms ease;
}
.search-box input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}
.search-box::before {
  content: '⌕';
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ink-3);
  font-size: 16px;
}
.search-result {
  padding: 10px 14px;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 6px;
  margin-bottom: 8px;
}
.search-result h4 {
  margin: 0 0 4px 0;
  font-size: 14px;
  font-weight: 500;
}
.search-result .sr-snippet {
  color: var(--ink-3);
  font-size: 12px;
}
.search-result mark {
  background: rgba(251,191,36,0.25);
  color: var(--warn);
  padding: 0 2px;
  border-radius: 2px;
}

/* ─── Forms ──────────────────────────────────────────────────────────────── */
form label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 14px 0 6px 0;
}
form input[type="text"],
form input[type="search"],
form select,
form textarea {
  width: 100%;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  color: var(--ink);
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 14px;
  font-family: var(--font-mono);
}
form textarea {
  min-height: 280px;
  line-height: 1.6;
  resize: vertical;
}
form button,
.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 8px 18px;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 120ms ease;
  margin-top: 14px;
  letter-spacing: 0.02em;
}
form button:hover { background: #7C3AED; }
form button.secondary,
.btn.secondary {
  background: var(--bg-panel);
  color: var(--ink-2);
  border: 1px solid var(--line);
}
form button.secondary:hover { background: var(--bg-hover); color: var(--ink); }
form button.danger {
  background: var(--down);
}

/* ─── Tag cloud ──────────────────────────────────────────────────────────── */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 16px 0;
}
.tag-cloud .tag {
  font-size: 13px;
  padding: 3px 10px;
}
.tag-cloud .tag.size-lg { font-size: 16px; font-weight: 600; }
.tag-cloud .tag.size-md { font-size: 14px; }
.tag-cloud .tag.size-sm { font-size: 11px; opacity: 0.7; }

/* ─── Footer ─────────────────────────────────────────────────────────────── */
footer {
  grid-area: footer;
  padding: 8px 16px;
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-4);
  display: flex;
  align-items: center;
  gap: 16px;
}
footer a { color: var(--ink-3); border: none; }
footer a:hover { color: var(--link); text-decoration: none; }
footer code {
  background: var(--bg);
  padding: 1px 5px;
  border-radius: 2px;
  color: var(--ink-3);
}

/* ─── Login form ─────────────────────────────────────────────────────────── */
body.auth {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  grid-template-areas: none;
}
.auth-card {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 28px 30px;
  width: 340px;
}
.auth-card h2 {
  margin: 0 0 18px 0;
  font-size: 18px;
  font-weight: 500;
}

/* ─── Muted helper ───────────────────────────────────────────────────────── */
.muted { color: var(--ink-3); font-size: 12px; }

/* ─── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  body,
  body.has-backlinks {
    grid-template-columns: 1fr;
    grid-template-rows: var(--header-h) auto 1fr auto;
    grid-template-areas:
      "header"
      "sidebar"
      "main"
      "footer";
  }
  aside.sidebar {
    max-height: 180px;
    border-right: none;
    border-bottom: 1px solid var(--line);
  }
  aside.backlinks { display: none; }
  main { padding: 20px 18px; }
  main .container { max-width: 100%; }
  nav { gap: 2px; }
  nav a { padding: 4px 7px; font-size: 11px; }
}