/* High-Performance Modern CSS Design System for HF Drive Index */
:root {
  --bg-main: #0b0f17;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(59, 130, 246, 0.4);
  
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  --accent-primary: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  
  --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.01) 100%);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 25px rgba(59, 130, 246, 0.25);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(59, 130, 246, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(139, 92, 246, 0.08) 0%, transparent 40%);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 15, 23, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.3rem;
  box-shadow: var(--shadow-glow);
}

.brand-title span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Search Bar */
.search-container {
  position: relative;
  flex: 1;
  max-width: 480px;
}

.search-input {
  width: 100%;
  padding: 0.65rem 1rem 0.65rem 2.6rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: var(--transition-fast);
  outline: none;
}

.search-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
  background: rgba(30, 41, 59, 0.9);
}

.search-icon {
  position: absolute;
  left: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1rem;
  pointer-events: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-icon {
  width: 38px;
  height: 38px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
}

.btn-icon.active {
  background: rgba(59, 130, 246, 0.2);
  color: var(--accent-primary);
  border-color: rgba(59, 130, 246, 0.4);
}

/* Main Layout */
.app-container {
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* Control Bar (Repo Info, Breadcrumbs, Views) */
.control-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  backdrop-filter: blur(12px);
}

.repo-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.75rem;
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 999px;
  color: var(--accent-primary);
  font-size: 0.825rem;
  font-weight: 600;
}

.repo-badge i {
  font-size: 0.9rem;
}

/* Breadcrumb */
.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  list-style: none;
  font-size: 0.9rem;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-secondary);
}

.breadcrumb-item a {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

.breadcrumb-item a:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
}

.breadcrumb-item.active {
  color: var(--text-primary);
  font-weight: 600;
}

.breadcrumb-separator {
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* View Controls & Filter Pills */
.view-options {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.filter-pills {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  overflow-x: auto;
  padding-bottom: 0.2rem;
}

.pill {
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  font-size: 0.775rem;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
}

.pill:hover, .pill.active {
  background: rgba(59, 130, 246, 0.2);
  border-color: rgba(59, 130, 246, 0.4);
  color: #fff;
}

/* Grid Layout */
.file-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.25rem;
}

.file-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  transition: var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.file-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  background: var(--bg-card-hover);
}

.file-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: transparent;
  transition: var(--transition-fast);
}

.file-card.is-dir::before {
  background: var(--accent-amber);
}

.file-card.is-video::before {
  background: var(--accent-rose);
}

.file-card.is-audio::before {
  background: var(--accent-emerald);
}

.file-card.is-image::before {
  background: var(--accent-purple);
}

.file-card.is-doc::before {
  background: var(--accent-primary);
}

.file-thumb {
  height: 110px;
  border-radius: var(--radius-md);
  background: rgba(0, 0, 0, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.75rem;
  color: var(--text-secondary);
  position: relative;
  overflow: hidden;
}

.file-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.file-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.file-name {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.775rem;
  color: var(--text-muted);
}

/* List Table View */
.file-table-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.file-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.file-table th {
  padding: 0.85rem 1.25rem;
  background: rgba(0, 0, 0, 0.3);
  color: var(--text-secondary);
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
  user-select: none;
}

.file-table th.sortable {
  cursor: pointer;
}

.file-table th.sortable:hover {
  color: var(--text-primary);
}

.file-table td {
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
}

.file-table tr:last-child td {
  border-bottom: none;
}

.file-table tr {
  transition: var(--transition-fast);
  cursor: pointer;
}

.file-table tr:hover {
  background: var(--bg-card-hover);
}

.table-file-name {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 500;
}

.table-file-icon {
  font-size: 1.25rem;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.05);
}

/* Quick Action Menu */
.action-btn-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Status / Empty / Loading States */
.state-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  text-align: center;
  gap: 1rem;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-xl);
}

.state-icon {
  font-size: 3.5rem;
  opacity: 0.8;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Modal System */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: #111827;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  max-width: 900px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.6);
  transform: scale(0.95);
  transition: transform 0.3s ease;
}

.modal-overlay.active .modal-content {
  transform: scale(1);
}

.modal-header {
  padding: 1.1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.modal-body {
  padding: 1.5rem;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* Form Styles for Repos & Settings Modal */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
  margin-bottom: 1.25rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input, .form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition-fast);
}

.form-input:focus, .form-select:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

/* Media Players inside Modal */
.video-player, .audio-player {
  width: 100%;
  border-radius: var(--radius-md);
  outline: none;
  background: #000;
}

.img-preview {
  max-width: 100%;
  max-height: 70vh;
  object-fit: contain;
  border-radius: var(--radius-md);
}

.code-preview {
  width: 100%;
  background: #090d14;
  color: #e5e7eb;
  padding: 1.25rem;
  border-radius: var(--radius-md);
  font-family: 'Fira Code', 'Courier New', monospace;
  font-size: 0.85rem;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 60vh;
}

/* Direct Link Box */
.link-box {
  width: 100%;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.link-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--accent-primary);
  font-family: monospace;
  font-size: 0.875rem;
  outline: none;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  background: rgba(17, 24, 39, 0.95);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-primary);
  color: var(--text-primary);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 1.25rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.825rem;
  background: rgba(11, 15, 23, 0.9);
}

.footer a {
  color: var(--accent-primary);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .navbar {
    padding: 0.75rem 1rem;
    flex-wrap: wrap;
  }
  .search-container {
    order: 3;
    max-width: 100%;
    width: 100%;
  }
  .app-container {
    padding: 1rem;
  }
  .file-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }
  .file-thumb {
    height: 80px;
    font-size: 2rem;
  }
}