/* ============================================
   MiData — MD Reader Engine
   Dark theme for GitHub Pages .md rendering
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- CSS Variables --- */
:root {
  --md-bg: #0d1117;
  --md-bg-secondary: #161b22;
  --md-bg-tertiary: #1c2128;
  --md-border: #30363d;
  --md-border-light: #21262d;
  --md-text: #e6edf3;
  --md-text-muted: #8b949e;
  --md-text-subtle: #6e7681;
  --md-link: #58a6ff;
  --md-link-hover: #79c0ff;
  --md-accent: #f78166;
  --md-accent-green: #3fb950;
  --md-accent-purple: #bc8cff;
  --md-accent-yellow: #d29922;
  --md-sidebar-width: 280px;
  --md-content-max: 900px;
  --md-radius: 6px;
  --md-player-accent: #f78166;
  --md-transition: 0.2s ease;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--md-bg);
  color: var(--md-text);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

/* --- Layout --- */
#miData {
  display: flex;
  min-height: 100vh;
}

/* --- Sidebar --- */
.md-sidebar {
  width: var(--md-sidebar-width);
  background: var(--md-bg-secondary);
  border-right: 1px solid var(--md-border);
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 100;
  transition: transform var(--md-transition);
  scrollbar-width: thin;
  scrollbar-color: var(--md-border) transparent;
}

.md-sidebar::-webkit-scrollbar {
  width: 4px;
}

.md-sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.md-sidebar::-webkit-scrollbar-thumb {
  background: var(--md-border);
  border-radius: 4px;
}

.md-sidebar-header {
  padding: 20px 16px;
  border-bottom: 1px solid var(--md-border);
  position: sticky;
  top: 0;
  background: var(--md-bg-secondary);
  z-index: 2;
}

.md-sidebar-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--md-text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.md-sidebar-title:hover {
  color: var(--md-link);
}

.md-sidebar-title .logo {
  font-size: 1.3rem;
}

.md-nav {
  padding: 12px 0;
}

.md-nav-section {
  margin-bottom: 4px;
}

.md-nav-folder {
  display: flex;
  align-items: center;
  padding: 6px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--md-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  user-select: none;
  transition: color var(--md-transition);
}

.md-nav-folder:hover {
  color: var(--md-text);
}

.md-nav-folder::before {
  content: '\25b8';
  margin-right: 6px;
  font-size: 0.7rem;
  transition: transform var(--md-transition);
}

.md-nav-folder.open::before {
  transform: rotate(90deg);
}

.md-nav-items {
  list-style: none;
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.3s ease;
}

.md-nav-folder.open + .md-nav-items {
  max-height: 2000px;
}

.md-nav-item {
  display: block;
}

.md-nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 16px 5px 28px;
  font-size: 0.875rem;
  color: var(--md-text-muted);
  text-decoration: none;
  transition: all var(--md-transition);
  border-left: 2px solid transparent;
}

.md-nav-link:hover {
  color: var(--md-text);
  background: var(--md-bg-tertiary);
}

.md-nav-link.active {
  color: var(--md-link);
  border-left-color: var(--md-link);
  background: rgba(88, 166, 255, 0.06);
}

.md-nav-link .icon {
  font-size: 0.8rem;
  opacity: 0.7;
}

/* Root files (no folder) */
.md-nav-root .md-nav-link {
  padding-left: 16px;
}

/* --- TOC (in-page) --- */
.md-toc {
  padding: 12px 16px;
  border-top: 1px solid var(--md-border);
  margin-top: 8px;
}

.md-toc-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--md-text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.md-toc-list {
  list-style: none;
}

.md-toc-link {
  display: block;
  padding: 3px 0 3px 0;
  font-size: 0.8rem;
  color: var(--md-text-muted);
  text-decoration: none;
  transition: color var(--md-transition);
}

.md-toc-link:hover {
  color: var(--md-text);
}

.md-toc-link.depth-2 { padding-left: 0; }
.md-toc-link.depth-3 { padding-left: 12px; }
.md-toc-link.depth-4 { padding-left: 24px; }

/* --- Mobile menu toggle --- */
.md-menu-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  width: 40px;
  height: 40px;
  border-radius: var(--md-radius);
  background: var(--md-bg-secondary);
  border: 1px solid var(--md-border);
  color: var(--md-text);
  font-size: 1.2rem;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: background var(--md-transition);
}

.md-menu-toggle:hover {
  background: var(--md-bg-tertiary);
}

/* --- Main Content --- */
.md-content {
  flex: 1;
  margin-left: var(--md-sidebar-width);
  min-height: 100vh;
}

.md-content-inner {
  max-width: var(--md-content-max);
  margin: 0 auto;
  padding: 40px 48px 80px;
}

/* --- Breadcrumb --- */
.md-breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--md-text-subtle);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.md-breadcrumb a {
  color: var(--md-text-muted);
  text-decoration: none;
  transition: color var(--md-transition);
}

.md-breadcrumb a:hover {
  color: var(--md-link);
}

.md-breadcrumb .separator {
  opacity: 0.5;
}

/* --- Typography --- */
.md-body h1, .md-body h2, .md-body h3,
.md-body h4, .md-body h5, .md-body h6 {
  color: var(--md-text);
  font-weight: 600;
  line-height: 1.3;
  margin-top: 2em;
  margin-bottom: 0.5em;
  scroll-margin-top: 80px;
}

.md-body h1 {
  font-size: 2rem;
  font-weight: 700;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--md-border);
  margin-top: 0;
}

.md-body h2 {
  font-size: 1.5rem;
  padding-bottom: 0.25em;
  border-bottom: 1px solid var(--md-border-light);
}

.md-body h3 { font-size: 1.25rem; }
.md-body h4 { font-size: 1.1rem; }
.md-body h5 { font-size: 1rem; }
.md-body h6 { font-size: 0.9rem; color: var(--md-text-muted); }

.md-body p {
  margin-bottom: 1em;
}

.md-body a {
  color: var(--md-link);
  text-decoration: none;
  transition: color var(--md-transition);
}

.md-body a:hover {
  color: var(--md-link-hover);
  text-decoration: underline;
}

.md-body strong { font-weight: 600; }
.md-body em { font-style: italic; }

.md-body hr {
  border: none;
  height: 1px;
  background: var(--md-border);
  margin: 2em 0;
}

/* --- Lists --- */
.md-body ul, .md-body ol {
  padding-left: 2em;
  margin-bottom: 1em;
}

.md-body li {
  margin-bottom: 0.25em;
}

.md-body li > ul,
.md-body li > ol {
  margin-top: 0.25em;
  margin-bottom: 0;
}

/* Task lists */
.md-body input[type="checkbox"] {
  margin-right: 6px;
  accent-color: var(--md-accent-green);
}

/* --- Blockquotes --- */
.md-body blockquote {
  border-left: 3px solid var(--md-accent);
  padding: 0.5em 1em;
  margin: 1em 0;
  color: var(--md-text-muted);
  background: var(--md-bg-secondary);
  border-radius: 0 var(--md-radius) var(--md-radius) 0;
}

.md-body blockquote p:last-child {
  margin-bottom: 0;
}

/* --- Code --- */
.md-body code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.875em;
  background: var(--md-bg-tertiary);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--md-accent);
}

.md-body pre {
  background: var(--md-bg-secondary);
  border: 1px solid var(--md-border);
  border-radius: var(--md-radius);
  padding: 16px;
  overflow-x: auto;
  margin: 1em 0;
  scrollbar-width: thin;
  scrollbar-color: var(--md-border) transparent;
}

.md-body pre code {
  background: none;
  padding: 0;
  color: var(--md-text);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* --- Tables --- */
.md-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 0.9rem;
}

.md-body th {
  background: var(--md-bg-secondary);
  font-weight: 600;
  text-align: left;
  padding: 10px 14px;
  border: 1px solid var(--md-border);
}

.md-body td {
  padding: 8px 14px;
  border: 1px solid var(--md-border);
}

.md-body tr:nth-child(even) {
  background: var(--md-bg-secondary);
}

/* --- Images --- */
.md-body img {
  max-width: 100%;
  border-radius: var(--md-radius);
  border: 1px solid var(--md-border);
  margin: 1em 0;
}

/* --- Badges (GitHub shields) --- */
.md-body img[src*="shields.io"],
.md-body img[src*="badge"] {
  border: none;
  border-radius: 0;
  margin: 0 2px;
  vertical-align: middle;
}

/* --- Alerts (GitHub style) --- */
.md-alert {
  padding: 12px 16px;
  margin: 1em 0;
  border-radius: var(--md-radius);
  border-left: 3px solid;
}

.md-alert-note { border-color: var(--md-link); background: rgba(88, 166, 255, 0.06); }
.md-alert-tip { border-color: var(--md-accent-green); background: rgba(63, 185, 80, 0.06); }
.md-alert-important { border-color: var(--md-accent-purple); background: rgba(188, 140, 255, 0.06); }
.md-alert-warning { border-color: var(--md-accent-yellow); background: rgba(210, 153, 34, 0.06); }
.md-alert-caution { border-color: var(--md-accent); background: rgba(247, 129, 102, 0.06); }

/* ============================================
   Audio Player
   ============================================ */
.md-audio-player {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--md-bg-secondary);
  border: 1px solid var(--md-border);
  border-radius: var(--md-radius);
  padding: 10px 16px;
  margin: 1em 0;
  transition: border-color var(--md-transition);
}

.md-audio-player:hover {
  border-color: var(--md-player-accent);
}

.md-audio-play-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--md-player-accent);
  border: none;
  color: #fff;
  font-size: 0.9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--md-transition);
}

.md-audio-play-btn:hover {
  transform: scale(1.08);
  filter: brightness(1.15);
}

.md-audio-info {
  flex: 1;
  min-width: 0;
}

.md-audio-title {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--md-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.md-audio-progress-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}

.md-audio-progress {
  flex: 1;
  height: 4px;
  background: var(--md-border);
  border-radius: 2px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.md-audio-progress-bar {
  height: 100%;
  background: var(--md-player-accent);
  border-radius: 2px;
  width: 0%;
  transition: width 0.1s linear;
}

.md-audio-time {
  font-size: 0.7rem;
  color: var(--md-text-subtle);
  font-family: 'JetBrains Mono', monospace;
  white-space: nowrap;
  min-width: 70px;
  text-align: right;
}

/* --- Audio Playlist --- */
.md-playlist {
  background: var(--md-bg-secondary);
  border: 1px solid var(--md-border);
  border-radius: var(--md-radius);
  margin: 1em 0;
  overflow: hidden;
}

.md-playlist-header {
  padding: 10px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--md-text-muted);
  border-bottom: 1px solid var(--md-border);
  display: flex;
  align-items: center;
  gap: 6px;
}

.md-playlist-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  cursor: pointer;
  transition: background var(--md-transition);
  border-bottom: 1px solid var(--md-border-light);
}

.md-playlist-item:last-child {
  border-bottom: none;
}

.md-playlist-item:hover {
  background: var(--md-bg-tertiary);
}

.md-playlist-item.playing {
  background: rgba(247, 129, 102, 0.08);
}

.md-playlist-item .track-num {
  font-size: 0.75rem;
  color: var(--md-text-subtle);
  width: 20px;
  text-align: center;
  font-family: 'JetBrains Mono', monospace;
}

.md-playlist-item .track-name {
  flex: 1;
  font-size: 0.85rem;
  color: var(--md-text);
}

/* --- Loading --- */
.md-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--md-text-subtle);
  gap: 10px;
}

.md-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--md-border);
  border-top-color: var(--md-link);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* --- Error --- */
.md-error {
  padding: 24px;
  text-align: center;
  color: var(--md-text-muted);
}

.md-error code {
  display: block;
  margin-top: 8px;
  font-size: 0.8rem;
}

/* --- Footer --- */
.md-footer {
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid var(--md-border);
  font-size: 0.75rem;
  color: var(--md-text-subtle);
  text-align: center;
}

.md-footer a {
  color: var(--md-text-muted);
  text-decoration: none;
}

.md-footer a:hover {
  color: var(--md-link);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .md-sidebar {
    transform: translateX(-100%);
  }

  .md-sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.5);
  }

  .md-menu-toggle {
    display: flex;
  }

  .md-content {
    margin-left: 0;
  }

  .md-content-inner {
    padding: 60px 20px 80px;
  }

  .md-body h1 {
    font-size: 1.6rem;
  }

  .md-body h2 {
    font-size: 1.3rem;
  }

  .md-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
  }

  .md-overlay.active {
    display: block;
  }
}

@media (max-width: 480px) {
  .md-content-inner {
    padding: 60px 16px 60px;
  }

  .md-audio-player {
    flex-wrap: wrap;
  }
}

/* --- Print --- */
@media print {
  .md-sidebar,
  .md-menu-toggle,
  .md-footer {
    display: none !important;
  }

  .md-content {
    margin-left: 0 !important;
  }

  .md-body {
    color: #000;
  }
}