/* ==========================================================================
   🏫 School Vault - Core Design System & Global Styles
   ========================================================================== */

/* --- Fonts & Variables --- */
:root {
  /* HSL Colors */
  --bg-primary: hsl(222, 47%, 6%);
  --bg-secondary: rgba(13, 20, 38, 0.65);
  --bg-tertiary: rgba(22, 32, 59, 0.8);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(139, 92, 246, 0.25);
  
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  --primary: hsl(263, 90%, 65%); /* Neon Violet */
  --primary-glow: rgba(139, 92, 246, 0.5);
  --accent: hsl(190, 95%, 50%);  /* Neon Cyan */
  --accent-glow: rgba(6, 182, 212, 0.5);
  
  --danger: hsl(350, 80%, 60%);
  --success: hsl(140, 70%, 50%);
  
  /* Fonts */
  --font-header: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'Fira Code', 'JetBrains Mono', SFMono-Regular, Consolas, monospace;
}

/* --- Global Resets & Body --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(at 0% 0%, rgba(139, 92, 246, 0.08) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(6, 182, 212, 0.08) 0px, transparent 50%);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  overflow-x: hidden;
}

/* --- Scrollbar Styles --- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
  transition: background 0.3s;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-header);
  font-weight: 600;
  letter-spacing: -0.02em;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: all 0.2s ease-in-out;
}

a:hover {
  color: var(--primary);
  text-shadow: 0 0 8px var(--primary-glow);
}

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in {
  animation: fadeInUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* --- Common Components (Glassmorphism) --- */
.glass-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  border-radius: 12px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-panel:hover {
  border-color: rgba(139, 92, 246, 0.2);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4), 0 0 15px rgba(139, 92, 246, 0.05);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  font-family: var(--font-header);
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid transparent;
  font-size: 0.9rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), hsl(263, 85%, 55%));
  color: white;
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(139, 92, 246, 0.4), 0 0 10px var(--primary-glow);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--text-secondary);
  color: white;
}

/* --- Breadcrumbs Navigation --- */
.nav-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-header);
  font-size: 0.95rem;
  padding: 12px 24px;
  background: rgba(13, 20, 38, 0.4);
  border-bottom: 1px solid var(--border-color);
}

.nav-breadcrumbs .separator {
  color: var(--text-muted);
}

.nav-breadcrumbs a {
  color: var(--text-secondary);
}

.nav-breadcrumbs a:hover {
  color: var(--accent);
}

.nav-breadcrumbs span.current {
  color: var(--text-primary);
  font-weight: 500;
}

/* ==========================================================================
   🏠 Layouts for Views
   ========================================================================== */

/* --- Home / Vault Hub --- */
.home-container {
  max-width: 1200px;
  margin: 40px auto;
  padding: 0 20px;
  flex: 1;
}

.home-header {
  text-align: center;
  margin-bottom: 40px;
  animation: fadeInUp 0.5s ease-out forwards;
}

.home-header h1 {
  font-size: 3rem;
  background: linear-gradient(135deg, #fff 30%, var(--accent) 70%, var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 12px;
}

.home-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Files Grid/Cards */
.files-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.file-card {
  display: flex;
  flex-direction: column;
  padding: 20px;
  position: relative;
  overflow: hidden;
}

.file-card .icon-wrapper {
  font-size: 2.5rem;
  margin-bottom: 15px;
  color: var(--accent);
}

.file-card h3 {
  font-size: 1.2rem;
  margin-bottom: 6px;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}

.file-card .meta {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 20px;
  display: flex;
  justify-content: space-between;
}

.file-card .actions {
  margin-top: auto;
  display: flex;
  gap: 10px;
}

.file-card .actions a {
  flex: 1;
  justify-content: center;
}

/* --- ZIP Explorer (3rd Image layout) --- */
.explorer-container {
  max-width: 1200px;
  margin: 30px auto;
  padding: 0 20px;
  flex: 1;
  width: 100%;
}

.explorer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.explorer-header h1 {
  font-size: 1.6rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.explorer-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
  overflow: hidden;
}

.explorer-table th, .explorer-table td {
  padding: 14px 20px;
  text-align: left;
}

.explorer-table th {
  background: rgba(22, 32, 59, 0.4);
  font-family: var(--font-header);
  font-weight: 600;
  border-bottom: 2px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.explorer-table tr {
  border-bottom: 1px solid var(--border-color);
  transition: background 0.2s;
}

.explorer-table tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

.explorer-table td.name-cell {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
}

.explorer-table td.name-cell i {
  font-size: 1.25rem;
}

.explorer-table td.name-cell a {
  color: var(--accent);
}

.explorer-table td.name-cell a:hover {
  color: var(--primary);
}

.explorer-table td.type-cell {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.explorer-table td.size-cell {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* --- Code/Text Viewer (2nd Image layout) --- */
.text-viewer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  padding: 40px 20px;
  max-width: 1000px;
  margin: 0 auto;
  width: 100%;
}

.text-viewer-title-box {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(13, 20, 38, 0.8);
  border: 1px solid var(--border-color);
  padding: 8px 24px;
  border-radius: 20px 20px 0 0;
  border-bottom: none;
  font-family: var(--font-header);
  font-weight: 600;
  font-size: 1rem;
  color: #ffaa44; /* Centered title color mimicking the image */
}

.code-container {
  width: 100%;
  position: relative;
  background: #0d1117; /* Slate-dark code block background */
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5);
}

.code-header-bar {
  display: flex;
  justify-content: flex-end;
  background: #161b22;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border-color);
}

.code-container pre {
  margin: 0;
  padding: 24px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.5;
}

.code-container code {
  font-family: var(--font-mono);
  background: none;
  padding: 0;
}

/* Custom scrollbar for pre blocks */
.code-container pre::-webkit-scrollbar {
  height: 6px;
}
.code-container pre::-webkit-scrollbar-thumb {
  background: var(--text-muted);
}
.code-container pre::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

.copy-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-family: var(--font-header);
  cursor: pointer;
  transition: all 0.2s;
}

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

.viewer-footer-msg {
  margin-top: 15px;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-align: center;
}

/* --- HTML Native PDF Viewer (1st Image layout) --- */
.pdf-viewer-layout {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.pdf-toolbar {
  height: 56px;
  background: #1f2937; /* Dark slate matching standard PDF viewer */
  border-bottom: 1px solid rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  color: white;
  z-index: 10;
}

.pdf-toolbar-left {
  display: flex;
  align-items: center;
  gap: 15px;
}

.pdf-document-title {
  font-weight: 500;
  font-size: 0.95rem;
}

.pdf-toolbar-center {
  display: flex;
  align-items: center;
  gap: 15px;
}

.pdf-zoom-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 8px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.pdf-zoom-btn {
  background: none;
  border: none;
  color: white;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
}

.pdf-zoom-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

.pdf-zoom-value {
  font-size: 0.85rem;
  min-width: 45px;
  text-align: center;
}

.pdf-toolbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.pdf-main-view {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
  background: #323639; /* Standard gray background for PDF rendering */
}

/* Sidebar thumbnails */
.pdf-sidebar {
  width: 200px;
  background: #202124;
  border-right: 1px solid rgba(0,0,0,0.3);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 15px 10px;
  gap: 15px;
  transition: width 0.3s ease;
}

.pdf-sidebar.collapsed {
  width: 0;
  padding: 0;
  overflow: hidden;
  border-right: none;
}

.pdf-thumbnail-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  gap: 4px;
}

.pdf-thumbnail-wrapper {
  border: 2px solid transparent;
  padding: 2px;
  background: white;
  border-radius: 4px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
  transition: border-color 0.2s;
  display: flex;
  justify-content: center;
  align-items: center;
}

.pdf-thumbnail-container.active .pdf-thumbnail-wrapper {
  border-color: var(--accent);
}

.pdf-thumbnail-container:hover .pdf-thumbnail-wrapper {
  border-color: var(--primary);
}

.pdf-thumbnail-num {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Canvas viewport */
.pdf-viewport {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  gap: 20px;
  scroll-behavior: smooth;
}

.pdf-page-container {
  background: white;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.pdf-loading-indicator {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--primary);
  font-family: var(--font-header);
}

/* --- Image Previewer Layout --- */
.image-viewer-container {
  max-width: 1100px;
  margin: 30px auto;
  padding: 0 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: 100%;
}

.image-canvas-wrapper {
  width: 100%;
  min-height: 500px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

.image-canvas-wrapper.grid-bg {
  /* Transparency grid background (checkered pattern) */
  background-image: 
    linear-gradient(45deg, #181c26 25%, transparent 25%),
    linear-gradient(-45deg, #181c26 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #181c26 75%),
    linear-gradient(-45deg, transparent 75%, #181c26 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
  background-color: #0f121d;
}

.image-canvas-wrapper img {
  max-width: 90%;
  max-height: 80vh;
  object-fit: contain;
  box-shadow: 0 10px 25px rgba(0,0,0,0.5);
  transition: transform 0.2s ease-out;
  border-radius: 4px;
}

.image-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 15px;
  background: rgba(22, 32, 59, 0.6);
  padding: 10px 20px;
  border-radius: 30px;
  border: 1px solid var(--border-color);
}

/* --- Media Player Layout --- */
.media-viewer-container {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
  flex: 1;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.custom-player-card {
  width: 100%;
  background: rgba(13, 20, 38, 0.85);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0,0,0,0.5);
}

.custom-video-wrapper {
  width: 100%;
  background: black;
  display: flex;
  justify-content: center;
  align-items: center;
  aspect-ratio: 16/9;
}

.custom-video-wrapper video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.audio-artwork-wrapper {
  padding: 60px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  background: linear-gradient(180deg, rgba(139, 92, 246, 0.1), transparent);
}

.audio-disk {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: radial-gradient(circle, #2d1b4e 20%, #0d1117 80%);
  border: 8px solid rgba(255, 255, 255, 0.05);
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5), 0 0 20px rgba(139, 92, 246, 0.2);
  animation: spin 10s linear infinite;
  animation-play-state: paused;
}

.custom-player-card.playing .audio-disk {
  animation-play-state: running;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.audio-disk-inner {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent);
}

.media-info {
  text-align: center;
  padding: 20px;
}

.media-info h2 {
  font-size: 1.4rem;
  margin-bottom: 6px;
  color: white;
}

.media-info p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Custom Controller Controls */
.player-controls {
  padding: 20px;
  background: #111827;
  border-top: 1px solid var(--border-color);
}

.timeline-container {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 15px;
}

.timeline-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.1);
  outline: none;
  cursor: pointer;
  transition: background 0.3s;
}

.timeline-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  cursor: pointer;
}

.time-display {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  min-width: 45px;
}

.control-buttons-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.left-controls, .right-controls {
  display: flex;
  align-items: center;
  gap: 15px;
}

.center-controls {
  display: flex;
  align-items: center;
  gap: 20px;
}

.play-pause-btn {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--primary);
  border: none;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.25rem;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 10px rgba(139, 92, 246, 0.3);
}

.play-pause-btn:hover {
  transform: scale(1.08);
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.5), 0 0 8px var(--primary-glow);
}

.control-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.1rem;
  cursor: pointer;
  transition: color 0.2s;
}

.control-btn:hover {
  color: white;
}

.volume-container {
  display: flex;
  align-items: center;
  gap: 8px;
}

.volume-slider {
  width: 80px;
  -webkit-appearance: none;
  height: 4px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
  outline: none;
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: white;
  cursor: pointer;
}

/* --- Markdown Viewer Layout --- */
.markdown-container {
  max-width: 900px;
  margin: 40px auto;
  padding: 40px;
  flex: 1;
  width: 100%;
}

.markdown-body {
  font-family: var(--font-body);
  color: var(--text-primary);
}

.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
  margin-top: 24px;
  margin-bottom: 16px;
  font-weight: 600;
  line-height: 1.25;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
}

.markdown-body p, .markdown-body ul, .markdown-body ol {
  margin-bottom: 16px;
}

.markdown-body ul, .markdown-body ol {
  padding-left: 24px;
}

.markdown-body li {
  margin-bottom: 4px;
}

.markdown-body blockquote {
  padding: 0 1em;
  color: var(--text-secondary);
  border-left: 0.25em solid var(--primary);
  margin-bottom: 16px;
}

.markdown-body code {
  padding: 0.2em 0.4em;
  margin: 0;
  font-size: 85%;
  background-color: rgba(255,255,255,0.06);
  border-radius: 6px;
  font-family: var(--font-mono);
}

.markdown-body pre {
  padding: 16px;
  overflow: auto;
  font-size: 85%;
  line-height: 1.45;
  background-color: #0d1117;
  border-radius: 8px;
  margin-bottom: 16px;
}

.markdown-body pre code {
  background: none;
  padding: 0;
  font-size: 100%;
  border-radius: 0;
}

/* --- Error View Layout --- */
.error-container {
  max-width: 600px;
  margin: 80px auto;
  padding: 40px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.error-container i {
  font-size: 4rem;
  color: var(--danger);
}

.error-container h1 {
  font-size: 2rem;
}

.error-container p {
  color: var(--text-secondary);
}

/* --- View HTML as Site Button --- */
.view-site-btn {
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.2);
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-family: var(--font-header);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.view-site-btn:hover {
  background: var(--accent);
  color: #0d1117;
  border-color: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow);
}