:root {
  --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.05);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent-color: #38bdf8;
  /* Sky Blue */
  --accent-glow: rgba(56, 189, 248, 0.3);
  --card-hover-bg: rgba(255, 255, 255, 0.07);
  --font-main: "Outfit", system-ui, sans-serif;

  /* Category Colors (Subtle/Tinted) */
  --cat-default: rgba(148, 163, 184, 0.15);
  --cat-indic: rgba(255, 153, 51, 0.15);
  /* Saffron Tint */
  --cat-indic-border: rgba(255, 153, 51, 0.4);
  --cat-modern: rgba(56, 189, 248, 0.15);
  --cat-ancient: rgba(168, 85, 247, 0.15);
  --cat-medieval: rgba(236, 72, 153, 0.15);
  --cat-general: rgba(20, 184, 166, 0.15);
}

/* Light Mode Overrides */
[data-theme="light"] {
  --bg-gradient: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(255, 255, 255, 0.4);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --accent-color: #0284c7;
  /* Darker Blue */
  --accent-glow: rgba(2, 132, 199, 0.3);
  --card-hover-bg: rgba(255, 255, 255, 0.8);

  /* Stronger tints for light mode */
  --cat-default: rgba(148, 163, 184, 0.1);
  --cat-indic: rgba(251, 146, 60, 0.15);
  --cat-indic-border: rgba(251, 146, 60, 0.4);
  --cat-modern: rgba(14, 165, 233, 0.1);
  --cat-ancient: rgba(168, 85, 247, 0.1);
  --cat-medieval: rgba(236, 72, 153, 0.1);
  --cat-general: rgba(20, 184, 166, 0.1);
}

[data-theme="light"] .search-bar input {
  background: rgba(255, 255, 255, 0.5);
  color: #0f172a;
  border-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .paper-card {
  background: white;
}

[data-theme="light"] .badge {
  background: rgba(0, 0, 0, 0.05);
  color: var(--text-secondary);
}

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

body {
  font-family: var(--font-main);
  background: #0f172a;
  /* Fallback */
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  transition:
    color 0.3s,
    background 0.3s;
}

/* Background */
.glass-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-gradient);
  z-index: -1;
  transition: background 0.5s;
}

/* Layout */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 1600px;
  margin: 0 auto;
  padding: 20px;
  gap: 20px;
}

/* Glass Panels */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  box-shadow: var(--glass-shadow);
  transition:
    background 0.3s,
    border-color 0.3s;
}

/* Header */
.header {
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-shrink: 0;
}

.icon-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  margin-left: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    color 0.2s,
    background 0.2s;
}

.icon-btn:hover {
  color: var(--accent-color);
  background: rgba(255, 255, 255, 0.1);
}

.hidden {
  display: none !important;
}

[data-theme="light"] .icon-btn:hover {
  background: rgba(0, 0, 0, 0.05);
}

.menu-toggle {
  display: none;
  /* Hidden on Desktop */
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  margin-right: 12px;
}

.logo {
  display: flex;
  align-items: center;
}

.logo h1 {
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: -0.5px;
  white-space: nowrap;
}

.logo span {
  color: var(--accent-color);
}

.badge {
  font-size: 0.75rem;
  padding: 4px 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-secondary);
  margin-left: 12px;
  text-transform: uppercase;
  font-weight: 500;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.badge.local {
  background: rgba(34, 197, 94, 0.2);
  color: #4ade80;
}

[data-theme="light"] .badge.local {
  background: rgba(34, 197, 94, 0.15);
  color: #15803d;
}

.badge.remote {
  background: rgba(56, 189, 248, 0.2);
  color: #38bdf8;
}

[data-theme="light"] .badge.remote {
  background: rgba(56, 189, 248, 0.15);
  color: #0284c7;
}

.badge.host {
  background: rgba(168, 85, 247, 0.2);
  color: #c084fc;
}

/* Purple for LocalHost */
[data-theme="light"] .badge.host {
  background: rgba(168, 85, 247, 0.15);
  color: #7e22ce;
}

.badge.ju {
  background: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
  font-size: 0.65rem;
  padding: 2px 6px;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s;
}

.badge.ju:hover {
  background: rgba(245, 158, 11, 0.4);
  color: #fff;
  transform: scale(1.1);
}

[data-theme="light"] .badge.ju {
  background: rgba(245, 158, 11, 0.15);
  color: #b45309;
}

[data-theme="light"] .badge.ju:hover {
  background: rgba(245, 158, 11, 0.25);
  color: #92400e;
}

/* Search Bar Layout */
.search-bar {
  position: relative;
  width: 600px;
  /* Wider to accommodate sort */
  display: flex;
  gap: 12px;
}

.search-input-wrapper {
  position: relative;
  flex: 1;
}

.search-bar input {
  width: 100%;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  padding: 12px 100px 12px 16px;
  /* Added right padding for buttons */
  color: white;
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  transition: all 0.2s;
}

/* Sort Dropdown */
.sort-dropdown {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  padding: 0 16px;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
  transition: all 0.2s;
  appearance: none;
  /* Custom arrow if needed, but default is fine for now */
  height: 48px;
  /* Match input height */
}

.sort-dropdown:hover,
.sort-dropdown:focus {
  border-color: var(--accent-color);
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

[data-theme="light"] .sort-dropdown {
  background: rgba(255, 255, 255, 0.5);
  color: var(--text-primary);
  border-color: rgba(0, 0, 0, 0.1);
}

/* Highlights */
mark {
  background: rgba(255, 215, 0, 0.25);
  color: inherit;
  border-radius: 2px;
  padding: 0 2px;
}

[data-theme="light"] mark {
  background: rgba(255, 215, 0, 0.4);
}

/* Source Icon */
.source-icon {
  margin-left: 8px;
  color: var(--text-secondary);
  opacity: 0.6;
  transition: opacity 0.2s;
  display: inline-flex;
  align-items: center;
}

.source-icon:hover {
  opacity: 1;
  color: var(--accent-color);
}

.search-actions {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-toggle {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  font-family: monospace;
  font-weight: bold;
  font-size: 0.8rem;
  transition: all 0.2s;
  opacity: 0.7;
}

.icon-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  opacity: 1;
}

.icon-toggle.active {
  background: var(--accent-glow);
  color: var(--accent-color);
  border-color: var(--accent-color);
  opacity: 1;
}

.search-icon {
  color: var(--text-secondary);
  display: flex;
  /* Fix alignment */
  align-items: center;
  /* Fix alignment */
  pointer-events: none;
}

/* Main Layout */
.main-layout {
  display: flex;
  flex: 1;
  gap: 20px;
  min-height: 0;
  /* Important for scroll */
  position: relative;
  /* For mobile menu absolute positioning context */
}

/* Sidebar */
.sidebar {
  width: 320px;
  /* Slightly wider for side-by-side */
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  overflow-y: auto;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

/* Side-by-side layout for large screens */
.filters-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  /* Safety for narrower viewports */
}

.filters-row > .filter-group {
  flex: 1;
  min-width: 120px;
  /* Don't squash too much */
}

.sidebar-header {
  display: none;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.close-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

.filter-actions {
  display: flex;
  justify-content: flex-end;
}

.btn-text {
  background: none;
  border: none;
  color: var(--accent-color);
  font-family: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  text-decoration: underline;
  opacity: 0.8;
}

.btn-text:hover {
  opacity: 1;
}

.sidebar h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 12px;
  letter-spacing: 1px;
  margin-top: 12px;
}

.checkbox-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
  line-height: 1.4;
}

.checkbox-item input {
  accent-color: var(--accent-color);
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.count {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.05);
  padding: 2px 6px;
  border-radius: 4px;
}

/* Results Area */
.results-area {
  flex: 1;
  overflow-y: auto;
  padding-right: 8px;
  /* Space for scrollbar */
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  padding-bottom: 40px;
}

/* Card */
.paper-card {
  background: var(--glass-bg);
  /* Fallback */
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition:
    transform 0.2s,
    background 0.2s;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
  /* Default Tint */
  background: linear-gradient(
    135deg,
    var(--cat-default),
    rgba(255, 255, 255, 0.02)
  );
}

.paper-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Dynamic Card Colors */
.paper-card.cat-Indic {
  background: linear-gradient(
    135deg,
    var(--cat-indic),
    rgba(255, 255, 255, 0.02)
  );
  border-color: var(--cat-indic-border);
}

.paper-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.paper-category {
  color: var(--accent-color);
  font-weight: 500;
  opacity: 0.9;
}

.paper-card.cat-Indic .paper-category {
  color: #fbbf24;
  /* Amber-400 */
}

.paper-title {
  font-size: 1.1rem;
  line-height: 1.4;
  font-weight: 500;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.paper-author {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: auto;
}

.size-info {
  font-size: 0.65rem;
  color: var(--text-secondary);
  opacity: 0.8;
  margin-right: 6px;
  margin-left: 6px;
}

.paper-footer {
  border-top: 1px solid var(--glass-border);
  padding-top: 12px;
  margin-top: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  /* Critical for vertical alignment */
  font-size: 0.75rem;
  opacity: 0.7;
}

.paper-card:hover .paper-footer {
  opacity: 1;
}

.footer-right {
  display: flex;
  align-items: center;
  gap: 8px;
  /* Tighter gap */
}

.read-link {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: white;
  /* Always white text on accent */
  text-decoration: none;
  padding: 4px 10px;
  border-radius: 6px;
  /* Pill shape */
  background: var(--accent-color);
  transition: all 0.2s;
  font-weight: 500;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.read-link:hover {
  background: #0ea5e9;
  /* Slightly darker shade of Sky Blue (Tailwind Sky-500) */
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

/* Light mode override for read-link hover */
[data-theme="light"] .read-link:hover {
  background: #0284c7;
  /* Darker blue */
}

.backup-link {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 6px;
  border-radius: 6px;
  background: transparent;
  transition: all 0.2s;
  border: 1px solid transparent;
  opacity: 0.6;
}

.backup-link:hover {
  color: var(--accent-color);
  background: rgba(var(--accent-color), 0.15);
  /* Slightly stronger bg on hover */
  opacity: 1;
  transform: scale(1.1);
  /* Micro interaction */
}

.backup-link span {
  font-weight: 500;
}

.vr-sep {
  width: 1px;
  height: 16px;
  background: var(--glass-border);
  margin: 0 4px;
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Stats */
.stats-panel {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--glass-border);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* --- Mobile Responsiveness --- */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
    margin-right: 8px;
    /* Reduce margin */
  }

  .search-bar {
    width: auto;
    flex: 1;
    min-width: 0;
    /* Critical for flex child shrinking */
    gap: 6px;
    /* Tighter gap */
  }

  .app-container {
    padding: 10px;
    gap: 10px;
  }

  .header {
    padding: 12px 10px;
    /* Tighter padding */
    gap: 10px;
    /* Reduce gap */
  }

  .logo {
    flex-shrink: 0;
    /* Stop shrinking, fixed tight width */
    display: flex;
    flex-direction: column;
    /* Stack vertically */
    align-items: center;
    /* Center align text */
    line-height: 0.9;
    margin-right: 4px;
    min-width: auto;
  }

  .logo h1 {
    font-size: 0.75rem;
    /* Tiny but readable */
    font-weight: 800;
    letter-spacing: 0.5px;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .logo span {
    display: block;
    /* Show it again */
    font-size: 0.7rem;
    color: var(--accent-color);
    letter-spacing: 0px;
  }

  .icon-btn {
    margin-left: 4px;
    /* Tighter spacing */
    padding: 4px;
    /* Smaller touch target visual, kept functional */
  }

  .badge {
    display: none;
    /* Hide Badge on mobile to save space */
  }

  /* Compact Sort Dropdown */
  .sort-dropdown {
    width: 40px;
    padding: 0;
    color: transparent;
    /* Hide text */

    /* SVG Sort Icon in background */
    background-color: rgba(255, 255, 255, 0.1);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m3 16 4 4 4-4'%3E%3C/path%3E%3Cpath d='M7 20V4'%3E%3C/path%3E%3Cpath d='m21 8-4-4-4 4'%3E%3C/path%3E%3Cpath d='M17 4v16'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;

    appearance: none;
    -webkit-appearance: none;
    overflow: hidden;
  }

  [data-theme="light"] .sort-dropdown {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%23475569' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m3 16 4 4 4-4'%3E%3C/path%3E%3Cpath d='M7 20V4'%3E%3C/path%3E%3Cpath d='m21 8-4-4-4 4'%3E%3C/path%3E%3Cpath d='M17 4v16'%3E%3C/path%3E%3C/svg%3E");
  }

  /* Mobile Sidebar overlay */
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 85%;
    max-width: 320px;
    z-index: 1000;
    background: var(--bg-gradient);
    /* Adaptive Background */
    backdrop-filter: blur(12px);
    /* Glass effect */
    -webkit-backdrop-filter: blur(12px);
    border-right: 1px solid var(--glass-border);
    transform: translateX(-110%);
    /* Hidden by default */
    box-shadow: 20px 0 50px rgba(0, 0, 0, 0.5);
    color: var(--text-primary);
    /* Ensure text color adapts */
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-header {
    display: flex;
  }

  .filters-row {
    flex-direction: column;
    /* Stack filters on mobile */
  }

  .results-area {
    padding: 0;
  }
}

/* --- Embed Mode --- */
[data-embed="true"] body {
  background: transparent !important;
}

[data-embed="true"] .glass-bg {
  display: none !important;
}

[data-embed="true"] .app-container {
  padding: 0;
  gap: 12px;
}

[data-embed="true"] .sidebar {
  display: none !important;
}

[data-embed="true"] .logo h1,
[data-embed="true"] .logo .badge,
[data-embed="true"] #theme-toggle,
[data-embed="true"] #menu-toggle {
  display: none !important;
}

[data-embed="true"] .header {
  padding: 8px 0;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
  border: none;
}

[data-embed="true"] .search-bar {
  width: 100%;
}

[data-embed="true"] .main-layout {
  gap: 0;
}