/* Hermes Wiki — Touch-First CSS for Phase 2
 *
 * Design principles:
 *   - Bottom-Nav on mobile (3 tabs: Files, Search, Graph)
 *   - Hamburger-Tree always off-canvas on mobile, slide-in on click
 *   - Graph shown via FAB-style toggle → opens full-screen modal
 *   - Desktop: 3-panel layout (tree 280px, content flex, graph 320px)
 *   - Tablet (768-1023px): 2-panel (tree 220px, content flex), graph as bottom panel
 *   - Mobile (<768px): 1-panel (content only), tree/graph via toggles
 *   - Tap targets ≥ 44px, no accidental 300ms delay
 *   - Safe-area-insets for iOS Dynamic Island
 *   - Pull-to-refresh via overscroll-behavior: contain
 */

:root {
  --bg-primary: #0a0a14;
  --bg-secondary: #0e0e1a;
  --bg-surface: #1a1a2e;
  --bg-elevated: #252537;
  --text-primary: #cdd6f4;
  --text-secondary: #a6adc8;
  --text-muted: #6c7086;
  --accent: #FFD700;
  --link: #FFD700;
  --link-visited: #cba6f7;
  --border: #313244;
  --green: #a6e3a1;
  --red: #f38ba8;
  --blue: #89b4fa;
  --teal: #94e2d5;
  --sat: env(safe-area-inset-top, 0px);
  --sab: env(safe-area-inset-bottom, 0px);
  --sal: env(safe-area-inset-left, 0px);
  --sar: env(safe-area-inset-right, 0px);
  --tap-min: 44px;
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  height: 100%;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Inter, sans-serif;
  font-size: 15px;
  background: var(--bg-primary);
  color: var(--text-primary);
  overscroll-behavior: contain; /* pull-to-refresh only where intended */
}

body {
  padding-top: var(--sat);
  padding-left: var(--sal);
  padding-right: var(--sar);
  padding-bottom: var(--sab);
}

/* ============================================================
 * Layout: Desktop (≥1024px) — 3-panel
 * ============================================================ */
.app-shell {
  display: grid;
  grid-template-columns: 280px 1fr 320px;
  grid-template-rows: 48px 1fr;
  height: 100vh;
  height: 100dvh;
  width: 100%;
  max-width: 100vw;
}

.app-header {
  grid-column: 1 / -1;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 50;
}

.brand {
  color: var(--accent);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.5px;
  text-decoration: none;
  white-space: nowrap;
}

#search {
  flex: 1;
  max-width: 480px;
  height: 36px;
  padding: 0 12px 0 36px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s;
}
#search:focus { border-color: var(--accent); }
#search::placeholder { color: var(--text-muted); }

.search-wrap { position: relative; flex: 1; max-width: 480px; }
.search-wrap::before {
  content: '🔍';
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 13px;
  pointer-events: none;
  opacity: 0.5;
}

.icon-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }

.app-tree {
  grid-column: 1;
  grid-row: 2;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
  padding: 8px 0;
  font-size: 13px;
}

.app-content {
  grid-column: 2;
  grid-row: 2;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 32px 48px 64px;
  max-width: 100%;
  word-wrap: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
}

.app-graph {
  grid-column: 3;
  grid-row: 2;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  overflow: hidden;
  position: relative;
  min-height: 0;
}

.app-graph canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
  cursor: grab;
}
.app-graph canvas:active { cursor: grabbing; }

/* ============================================================
 * Tree rendering
 * ============================================================ */
.tree-root { padding: 4px 0; }
.tree-folder { margin: 1px 0; }
.tree-folder-header {
  display: flex;
  align-items: center;
  padding: 6px 12px;
  gap: 6px;
  cursor: pointer;
  user-select: none;
  color: var(--text-secondary);
  font-weight: 500;
  border-radius: 4px;
  margin: 1px 4px;
  min-height: var(--tap-min);
  font-size: 13px;
}
.tree-folder-header:hover { background: rgba(255, 215, 0, 0.05); }
.tree-folder-header.active { background: rgba(255, 215, 0, 0.08); color: var(--accent); }
.tree-folder-header .arrow {
  color: var(--text-muted);
  font-size: 10px;
  width: 12px;
  display: inline-block;
  transition: transform 0.15s;
}
.tree-folder.open > .tree-folder-header .arrow { transform: rotate(90deg); }
.tree-children { padding-left: 12px; display: none; }
.tree-folder.open > .tree-children { display: block; }

.tree-file {
  display: block;
  padding: 6px 12px 6px 24px;
  color: var(--text-primary);
  text-decoration: none;
  border-radius: 4px;
  margin: 1px 4px;
  min-height: var(--tap-min);
  font-size: 13px;
  display: flex;
  align-items: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.tree-file:hover { background: rgba(255, 215, 0, 0.05); color: var(--accent); }
.tree-file.current {
  background: rgba(255, 215, 0, 0.12);
  color: var(--accent);
  border-left: 3px solid var(--accent);
  padding-left: 21px;
}
.tree-file-icon { margin-right: 6px; opacity: 0.5; }

/* ============================================================
 * Note content
 * ============================================================ */
.note { max-width: 920px; margin: 0 auto; }
.meta-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 18px;
  margin-bottom: 24px;
  font-size: 12px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 6px 16px;
}
.meta-row {
  display: flex;
  gap: 8px;
  align-items: baseline;
  min-width: 0;
}
.meta-key {
  color: var(--accent);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 10px;
  letter-spacing: 0.5px;
  min-width: 70px;
  flex-shrink: 0;
}
.meta-value {
  color: var(--text-secondary);
  word-break: break-word;
  font-family: ui-monospace, 'SF Mono', Monaco, monospace;
  font-size: 11px;
}

.note-body {
  line-height: 1.7;
  font-size: 16px;
}
.note-body h1 { font-size: 2em; margin: 0.6em 0 0.4em; padding-bottom: 8px; border-bottom: 1px solid var(--border); color: var(--text-primary); }
.note-body h2 { font-size: 1.5em; margin: 1.5em 0 0.5em; color: var(--text-primary); border-bottom: 1px solid rgba(49,50,68,0.5); padding-bottom: 4px; }
.note-body h3 { font-size: 1.25em; margin: 1.2em 0 0.4em; color: var(--text-primary); }
.note-body h4 { font-size: 1.1em; margin: 1em 0 0.4em; color: var(--text-secondary); }
.note-body p { margin: 0.8em 0; }
.note-body ul, .note-body ol { margin: 0.5em 0; padding-left: 1.8em; }
.note-body li { margin: 0.3em 0; }
.note-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5em 1em;
  margin: 1em 0;
  background: rgba(255, 215, 0, 0.04);
  color: var(--text-secondary);
  font-style: italic;
}
.note-body code {
  background: var(--bg-surface);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: ui-monospace, 'SF Mono', Monaco, monospace;
  font-size: 0.9em;
  color: var(--teal);
}
.note-body pre {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  padding: 14px 16px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1em 0;
  font-size: 13px;
  line-height: 1.5;
}
.note-body pre code {
  background: transparent;
  padding: 0;
  color: var(--text-primary);
  font-size: inherit;
}
.note-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 14px;
  display: block;
  overflow-x: auto;
}
.note-body th {
  background: var(--bg-surface);
  padding: 8px 12px;
  text-align: left;
  border: 1px solid var(--border);
  font-weight: 600;
  color: var(--accent);
}
.note-body td {
  padding: 8px 12px;
  border: 1px solid var(--border);
}
.note-body tr:nth-child(even) { background: rgba(30, 30, 50, 0.3); }
.note-body a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 215, 0, 0.3);
}
.note-body a:hover { border-bottom-color: var(--accent); }
.note-body a:visited { color: var(--link-visited); }
.note-body .wikilink {
  color: var(--blue);
  border-bottom: 1px dashed var(--blue);
}
.note-body .wikilink:hover { color: var(--accent); border-bottom-color: var(--accent); }
.note-body .wikilink-missing {
  color: var(--text-muted);
  border-bottom: 1px dotted var(--text-muted);
  text-decoration: line-through;
}
.note-body img { max-width: 100%; height: auto; border-radius: 6px; margin: 1em 0; }
.note-body hr { border: none; border-top: 1px solid var(--border); margin: 2em 0; }
.note-body .headerlink { color: var(--text-muted); margin-left: 8px; font-size: 0.7em; text-decoration: none; opacity: 0; transition: opacity 0.15s; }
.note-body h1:hover .headerlink, .note-body h2:hover .headerlink, .note-body h3:hover .headerlink { opacity: 1; }

/* TOC sidebar (in note footer area) */
.note-toc {
  margin-top: 48px;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  font-size: 13px;
}
.note-toc-title {
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.note-toc ul { list-style: none; padding-left: 0; }
.note-toc li { margin: 3px 0; }
.note-toc a {
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: none;
}
.note-toc a:hover { color: var(--accent); }
.note-toc ul ul { padding-left: 16px; }

/* Backlinks section */
.note-backlinks {
  margin-top: 24px;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  font-size: 13px;
}
.note-backlinks-title {
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.note-backlinks ul { list-style: none; padding-left: 0; }
.note-backlinks li { margin: 4px 0; }
.note-backlinks a { color: var(--blue); border-bottom: 1px dashed var(--blue); }

.note-footer {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-muted);
  font-family: ui-monospace, 'SF Mono', Monaco, monospace;
}

/* ============================================================
 * Search dropdown
 * ============================================================ */
.search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 6px 6px;
  max-height: 60vh;
  overflow-y: auto;
  display: none;
  z-index: 100;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
}
.search-results.open { display: block; }
.search-result {
  display: block;
  padding: 10px 16px;
  color: var(--text-primary);
  text-decoration: none;
  border-bottom: 1px solid rgba(49, 50, 68, 0.3);
  min-height: var(--tap-min);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.search-result:hover, .search-result.active {
  background: rgba(255, 215, 0, 0.08);
}
.search-result-title {
  font-weight: 600;
  font-size: 13px;
}
.search-result-path {
  font-size: 11px;
  color: var(--text-muted);
  font-family: ui-monospace, monospace;
}
.search-result-tag {
  display: inline-block;
  background: var(--bg-surface);
  color: var(--accent);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 10px;
  margin-right: 4px;
}
.search-empty {
  padding: 16px;
  color: var(--text-muted);
  font-size: 12px;
  text-align: center;
}

/* ============================================================
 * Graph modal (full-screen on mobile)
 * ============================================================ */
.graph-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  z-index: 200;
  flex-direction: column;
  padding-top: var(--sat);
  padding-left: var(--sal);
  padding-right: var(--sar);
  padding-bottom: var(--sab);
}
.graph-modal.open { display: flex; }
.graph-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  height: 48px;
  flex-shrink: 0;
}
.graph-modal-title {
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
}
.graph-modal-close {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 18px;
}
.graph-modal-close:hover { color: var(--accent); border-color: var(--accent); }
.graph-modal-canvas {
  flex: 1;
  position: relative;
  overflow: hidden;
  touch-action: none; /* critical: prevent iOS Safari scroll-hijacking */
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  min-height: 0; /* flex-child needs explicit min-height for sizing */
  width: 100%;
  height: 100%;
}
.graph-modal-canvas canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
  cursor: grab;
  touch-action: none; /* critical: same on canvas itself */
  -webkit-user-select: none;
  user-select: none;
}
.graph-modal-canvas canvas:active { cursor: grabbing; }

/* Modal body must not scroll on background */
.graph-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  z-index: 200;
  flex-direction: column;
  padding-top: var(--sat);
  padding-left: var(--sal);
  padding-right: var(--sar);
  padding-bottom: var(--sab);
  touch-action: none;
  overscroll-behavior: contain;
}
.graph-modal.open { display: flex; }

/* Graph legend (small floating panel) */
.graph-legend {
  position: absolute;
  bottom: 12px;
  left: 12px;
  background: rgba(14, 14, 26, 0.92);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 11px;
  color: var(--text-secondary);
  z-index: 10;
}
.graph-legend-title {
  color: var(--accent);
  font-weight: 700;
  font-size: 10px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.graph-legend-row { display: flex; align-items: center; gap: 6px; margin: 2px 0; }
.graph-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ============================================================
 * Bottom navigation (mobile only)
 * ============================================================ */
.app-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  z-index: 150;
  padding-bottom: var(--sab);
}
.app-bottom-nav-inner {
  display: flex;
  justify-content: space-around;
  height: 56px;
}
.app-bottom-nav button {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 11px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  cursor: pointer;
  min-height: var(--tap-min);
  padding: 4px 0;
}
.app-bottom-nav button:hover, .app-bottom-nav button.active { color: var(--accent); }
.app-bottom-nav button span.icon { font-size: 18px; line-height: 1; }

/* ============================================================
 * Tablet (768px-1023px) — 2-panel + bottom graph
 * ============================================================ */
@media (max-width: 1023px) {
  .app-shell {
    grid-template-columns: 220px 1fr;
    grid-template-rows: 48px 1fr 240px;
  }
  .app-tree {
    grid-column: 1;
    grid-row: 2 / 4;
    border-right: 1px solid var(--border);
  }
  .app-content {
    grid-column: 2;
    grid-row: 2;
    padding: 24px 32px 32px;
  }
  .app-graph {
    grid-column: 1 / -1;
    grid-row: 3;
    border-left: none;
    border-top: 1px solid var(--border);
    height: 240px;
  }
}

/* ============================================================
 * Mobile (<768px) — single column + bottom-nav
 * ============================================================ */
@media (max-width: 767px) {
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-rows: 48px 1fr;
  }
  .app-header { padding: 0 12px; gap: 8px; }
  .app-header .icon-btn[data-action="toggle-tree"],
  .app-header .icon-btn[data-action="toggle-graph"] {
    display: none; /* hide redundant buttons, use bottom-nav */
  }
  .search-wrap { max-width: none; }

  .app-tree {
    position: fixed;
    top: 48px;
    top: calc(48px + var(--sat));
    left: 0;
    bottom: 56px;
    bottom: calc(56px + var(--sab));
    width: 85vw;
    max-width: 320px;
    transform: translateX(-100%);
    transition: transform 0.25s ease-in-out;
    z-index: 250;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: block;
  }
  .app-tree.open { transform: translateX(0); }

  .app-content {
    grid-column: 1;
    grid-row: 2;
    padding: 16px 20px 72px; /* bottom-nav space + safe area */
  }

  .app-graph { display: none; }

  .app-bottom-nav { display: block; }
}

/* Backdrop for mobile tree/graph overlay */
.backdrop {
  display: none;
  position: fixed;
  top: 48px;
  top: calc(48px + var(--sat));
  left: 0;
  right: 0;
  bottom: 56px;
  bottom: calc(56px + var(--sab));
  background: rgba(0, 0, 0, 0.6);
  z-index: 200;
}
.backdrop.open { display: block; }

/* ============================================================
 * Inline highlight for hash anchors
 * ============================================================ */
:target { scroll-margin-top: 60px; }
:target h1, :target h2, :target h3 {
  background: rgba(255, 215, 0, 0.08);
  transition: background 0.6s ease-out;
}