/* Modern, Clean, Production-Ready File Manager Stylesheet */
:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --bg-main: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --border: #e2e8f0;
  --border-focus: #818cf8;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-sub: #334155;
  --success: #10b981;
  --success-bg: #ecfdf5;
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  --warning: #f59e0b;
  --radius: 10px;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.05);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Navbar */
.navbar {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.03);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

.nav-brand svg {
  width: 26px;
  height: 26px;
}

.nav-search {
  flex: 1;
  max-width: 460px;
  margin: 0 1.5rem;
}

.search-form {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input {
  width: 100%;
  padding: 0.55rem 1rem 0.55rem 2.4rem;
  border-radius: 9999px;
  border: 1px solid var(--border);
  background-color: #f1f5f9;
  font-size: 0.9rem;
  color: var(--text-main);
  transition: all 0.2s ease;
}

.search-input:focus {
  outline: none;
  background-color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.search-icon {
  position: absolute;
  left: 0.8rem;
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  pointer-events: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.user-badge {
  font-size: 0.85rem;
  color: var(--text-sub);
  background-color: var(--primary-light);
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  font-weight: 600;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem;
  flex: 1;
}

/* Banners */
.banner {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.banner-error {
  background-color: var(--danger-bg);
  border: 1px solid #fca5a5;
  color: #991b1b;
}

.banner-success {
  background-color: var(--success-bg);
  border: 1px solid #6ee7b7;
  color: #065f46;
}

/* Grid & Sidebar */
.dashboard-grid {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 1.5rem;
}

@media (max-width: 840px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

.sidebar-panel {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.sidebar-section h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Tree & Category Navigation */
.cat-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.cat-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.45rem 0.65rem;
  border-radius: 6px;
  text-decoration: none;
  color: var(--text-sub);
  font-size: 0.9rem;
  transition: all 0.15s ease;
}

.cat-item:hover {
  background-color: #f1f5f9;
  color: var(--primary);
}

.cat-item.active {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

.cat-depth-1 { padding-left: 0.65rem; }
.cat-depth-2 { padding-left: 1.4rem; }
.cat-depth-3 { padding-left: 2.1rem; }
.cat-depth-4 { padding-left: 2.8rem; }

/* Tag cloud */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.55rem;
  background-color: #f1f5f9;
  border: 1px solid var(--border);
  border-radius: 9999px;
  font-size: 0.75rem;
  color: var(--text-sub);
  text-decoration: none;
  transition: all 0.15s ease;
}

.tag-pill:hover, .tag-pill.active {
  background-color: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

/* Main Content Area */
.main-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Action Header */
.action-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow);
}

.action-buttons {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 0.95rem;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-secondary {
  background-color: #ffffff;
  border-color: var(--border);
  color: var(--text-sub);
}

.btn-secondary:hover {
  background-color: #f8fafc;
  border-color: #cbd5e1;
}

.btn-danger {
  background-color: var(--danger-bg);
  border-color: #fecaca;
  color: var(--danger);
}

.btn-danger:hover {
  background-color: var(--danger);
  color: #ffffff;
}

.btn-sm {
  padding: 0.25rem 0.55rem;
  font-size: 0.8rem;
}

/* Cards & Tables */
.card-section {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.items-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.items-table th {
  text-align: left;
  padding: 0.65rem 0.85rem;
  border-bottom: 2px solid var(--border);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.items-table td {
  padding: 0.75rem 0.85rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-sub);
  vertical-align: middle;
}

.items-table tr:hover td {
  background-color: #f8fafc;
}

.item-name-cell {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 500;
  color: var(--text-main);
}

.item-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  color: var(--text-muted);
}

.item-icon.mp3 {
  color: #8b5cf6;
}

.actions-cell {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  justify-content: flex-end;
}

/* Single-Click MP3 Play Button */
.play-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background-color: #f5f3ff;
  border: 1px solid #ddd6fe;
  color: #6d28d9;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.15s ease;
}

.play-btn:hover {
  background-color: #6d28d9;
  color: #ffffff;
}

/* Sticky Audio Player Bar */
.audio-player-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: #1e1b4b;
  color: #ffffff;
  padding: 0.75rem 1.5rem;
  display: none;
  align-items: center;
  justify-content: space-between;
  z-index: 100;
  box-shadow: 0 -4px 10px rgba(0, 0, 0, 0.2);
}

.audio-player-bar.active {
  display: flex;
}

.audio-track-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  max-width: 300px;
}

.audio-track-name {
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.audio-native-player {
  flex: 1;
  max-width: 600px;
  height: 34px;
}

/* Forms & Dialogs */
.form-group {
  margin-bottom: 1.15rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-sub);
  margin-bottom: 0.4rem;
}

.form-control {
  width: 100%;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--text-main);
  background-color: #ffffff;
  transition: all 0.15s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

textarea.form-control {
  min-height: 180px;
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* Native Modal Dialogs */
dialog {
  margin: auto;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 480px;
  background-color: var(--bg-surface);
}

dialog::backdrop {
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(2px);
}

.dialog-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.dialog-title {
  font-size: 1.15rem;
  font-weight: 600;
}

.dialog-close {
  background: none;
  border: none;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
}

/* Footer Versioning & Aesthetics */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  background-color: var(--bg-surface);
  padding: 1.25rem 1.5rem;
  text-align: center;
  font-size: 0.825rem;
  color: var(--text-muted);
}

.footer-content {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.footer-version {
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
}

/* Drag and Drop Overlay */
.drop-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  pointer-events: none;
}

.drop-overlay-box {
  background: #ffffff;
  border: 3px dashed var(--primary);
  border-radius: 16px;
  padding: 3rem 4rem;
  text-align: center;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2);
  color: var(--primary);
  transform: scale(1.05);
  transition: transform 0.2s ease;
}

/* Markdown Rendering Styles */
.markdown-body {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-main);
}

.markdown-body h1.md-h1 { font-size: 1.6rem; font-weight: 700; margin: 1.25rem 0 0.75rem; border-bottom: 1px solid var(--border); padding-bottom: 0.4rem; }
.markdown-body h2.md-h2 { font-size: 1.35rem; font-weight: 600; margin: 1.1rem 0 0.6rem; border-bottom: 1px solid var(--border); padding-bottom: 0.3rem; }
.markdown-body h3.md-h3 { font-size: 1.15rem; font-weight: 600; margin: 0.9rem 0 0.5rem; }
.markdown-body .md-quote { border-left: 4px solid var(--primary); padding: 0.5rem 1rem; margin: 0.75rem 0; background: var(--primary-light); border-radius: 0 6px 6px 0; color: var(--text-sub); }
.markdown-body .md-code-block { background: #0f172a; color: #f8fafc; padding: 1rem; border-radius: 8px; overflow-x: auto; margin: 0.75rem 0; font-family: ui-monospace, monospace; font-size: 0.85rem; }
.markdown-body .md-inline-code { background: #f1f5f9; color: #be185d; padding: 0.15rem 0.4rem; border-radius: 4px; font-size: 0.85rem; font-family: ui-monospace, monospace; }
.markdown-body .md-ul { padding-left: 1.5rem; margin: 0.75rem 0; }
.markdown-body .md-li { margin: 0.25rem 0; }