/* ==========================================================================
   Resource Catalog - Modern Self-Contained Stylesheet
   Pure CSS - Dark/Light Mode, Responsive, Zero External Dependencies
   ========================================================================== */

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --bg-hover: #f1f5f9;
  --border-color: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent-color: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #eff6ff;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
  --card-shadow-hover: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

html.dark {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-hover: #334155;
  --border-color: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --accent-color: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-light: #1e3a8a33;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  --card-shadow-hover: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
}

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

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

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

a:hover {
  text-decoration: underline;
}

/* --- Layout & Navbar --- */
.navbar {
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 0.75rem 1.5rem;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand-icon {
  font-size: 1.5rem;
}

.nav-links {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.nav-links a {
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: all 0.15s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-color);
  background-color: var(--accent-light);
  text-decoration: none;
}

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

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

.search-input {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  color: var(--text-primary);
  width: 220px;
  transition: width 0.2s ease, border-color 0.2s ease;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-color);
  width: 280px;
}

/* --- Buttons & UI Elements --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
  background-color: transparent;
  color: var(--text-primary);
}

.btn:hover {
  text-decoration: none;
}

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

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

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

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

.btn-ghost {
  border: none;
  color: var(--text-secondary);
}

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

.btn-sm {
  padding: 0.3rem 0.6rem;
  font-size: 0.8rem;
}

.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border-radius: 999px;
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.tag-pill {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 999px;
  background-color: var(--accent-light);
  color: var(--accent-color);
  text-decoration: none;
  transition: opacity 0.15s ease;
}

.tag-pill:hover {
  opacity: 0.8;
  text-decoration: none;
}

/* --- Main Layout --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  width: 100%;
  flex: 1;
}

/* --- About Landing Page --- */
.about-page {
  max-width: 860px;
  margin: 0 auto;
}

.about-hero {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  display: flex;
  align-items: center;
  gap: 2rem;
  box-shadow: var(--card-shadow);
  margin-bottom: 2rem;
}

.about-avatar-container {
  flex-shrink: 0;
}

.author-avatar {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent-light);
}

.avatar-placeholder {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background-color: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
}

.author-name {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.35rem;
}

.author-tagline {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.author-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.author-link-badge {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: all 0.15s ease;
}

.author-link-badge:hover {
  background-color: var(--accent-light);
  color: var(--accent-color);
  border-color: var(--accent-color);
  text-decoration: none;
}

.about-bio {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--card-shadow);
  margin-bottom: 2rem;
}

.about-cta-container {
  text-align: center;
  margin: 2.5rem 0;
}

.cta-btn {
  padding: 0.85rem 2rem;
  font-size: 1.1rem;
  border-radius: var(--radius-md);
  font-weight: 600;
}

/* --- Catalog View --- */
.catalog-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.breadcrumbs-container {
  font-size: 1.05rem;
  font-weight: 500;
}

.breadcrumbs-container .sep {
  color: var(--text-muted);
  margin: 0 0.35rem;
}

.breadcrumbs-container .current {
  color: var(--text-secondary);
}

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

.view-toggle {
  display: flex;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.view-toggle button {
  border-radius: 0;
  border: none;
  background: transparent;
}

.view-toggle button.active {
  background-color: var(--accent-light);
  color: var(--accent-color);
  font-weight: 600;
}

.filter-bar {
  margin-bottom: 1.5rem;
}

.pills-scroll {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.filter-pill {
  white-space: nowrap;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.15s ease;
}

.filter-pill:hover,
.filter-pill.active {
  background-color: var(--accent-color);
  color: #ffffff;
  border-color: var(--accent-color);
  text-decoration: none;
}

.folder-overview {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

/* Subfolders */
.subfolders-section {
  margin-bottom: 2rem;
}

.section-title {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.subfolders-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.subfolder-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  box-shadow: var(--card-shadow);
  transition: all 0.15s ease;
  color: var(--text-primary);
}

.subfolder-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--accent-color);
  text-decoration: none;
}

.subfolder-icon {
  font-size: 1.75rem;
}

.subfolder-title {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
}

.subfolder-count {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Results header */
.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.results-count {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.clear-filters-link {
  font-size: 0.85rem;
  color: var(--accent-color);
}

/* Grid View */
.resources-container.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 1.25rem;
}

.resource-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--card-shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.resource-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-shadow-hover);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.card-icon {
  font-size: 1.75rem;
}

.card-body {
  flex: 1;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
  line-height: 1.3;
}

.card-title-link:hover .card-title {
  color: var(--accent-color);
}

.card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  display: flex;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.card-footer {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
}

/* Table View */
.table-wrapper {
  overflow-x: auto;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--card-shadow);
}

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

.catalog-table th {
  background-color: var(--bg-secondary);
  padding: 0.75rem 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
}

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

.catalog-table tr:hover td {
  background-color: var(--bg-hover);
}

.col-icon {
  width: 40px;
  font-size: 1.25rem;
  text-align: center;
}

.col-title .item-link {
  font-weight: 600;
  color: var(--text-primary);
}

.col-title .item-table-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.col-size {
  white-space: nowrap;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.col-actions {
  white-space: nowrap;
  display: flex;
  gap: 0.35rem;
}

/* --- Empty / Loading States --- */
.empty-state {
  text-align: center;
  padding: 3.5rem 1.5rem;
  background-color: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
}

.empty-state h3 {
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
}

.empty-state p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 480px;
  margin: 0 auto;
}

/* --- Item Detail View --- */
.item-detail-view {
  max-width: 800px;
  margin: 0 auto;
}

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

.back-link {
  font-size: 0.95rem;
  font-weight: 500;
}

.item-detail-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--card-shadow);
}

.item-detail-top {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.detail-icon {
  font-size: 2.75rem;
}

.detail-title {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.2;
}

.detail-filename {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.detail-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.detail-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
  padding: 1rem;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

.detail-tags {
  margin-bottom: 1.5rem;
}

.text-preview-box {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-bottom: 1.5rem;
  max-height: 350px;
  overflow-y: auto;
}

.text-preview-box pre {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  white-space: pre-wrap;
  word-break: break-all;
}

.detail-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

/* --- Markdown Typography --- */
.markdown-body {
  line-height: 1.7;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  color: var(--text-primary);
  margin-top: 1.25rem;
  margin-bottom: 0.75rem;
}

.markdown-body p {
  margin-bottom: 1rem;
}

.markdown-body ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.markdown-body pre {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.markdown-body code {
  font-family: var(--font-mono);
  background-color: var(--bg-secondary);
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}

/* --- Toast Notification --- */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: var(--text-primary);
  color: var(--bg-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  pointer-events: none;
  z-index: 100;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive Mobile Queries --- */
@media (max-width: 768px) {
  .nav-container {
    flex-wrap: wrap;
  }
  .search-input {
    width: 100%;
  }
  .search-input:focus {
    width: 100%;
  }
  .about-hero {
    flex-direction: column;
    text-align: center;
  }
  .author-links {
    justify-content: center;
  }
  .detail-actions {
    flex-direction: column;
  }
}