/* ==========================================================================
   DEN TAMME BEVER DIGITAL GARDEN - HIGH-END EDITORIAL MINIMALISM
   Combining extreme performance with high-fidelity, content-focused styling.
   ========================================================================== */

/* --- Design Tokens & CSS Variables --- */
:root {
  /* Light Theme (Crisp Editorial Ivory) */
  --bg-primary: #ffffff;
  --bg-secondary: #fafafa;
  --bg-tertiary: #f4f4f5;
  
  --text-primary: #09090b;
  --text-secondary: #27272a;
  --text-muted: #71717a;
  
  --accent-primary: #0f766e; /* Forest Pine Green (Bever organic) */
  --accent-hover: #0d9488;
  
  --border-color: #e4e4e7;
  --border-hover: #18181b;
  
  /* Premium, privacy-first, zero-request system font stacks (San Francisco on Mac, Segoe on Windows) */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-display: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", JetBrains Mono, Menlo, Monaco, Consolas, monospace;
  
  --transition-fast: 0.12s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark Theme (Prism Deep Charcoal) */
[data-theme="dark"] {
  --bg-primary: #09090b;
  --bg-secondary: #141416;
  --bg-tertiary: #202024;
  
  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #52525b;
  
  --accent-primary: #2dd4bf; /* Mint Teal (River theme) */
  --accent-hover: #38bdf8;
  
  --border-color: #27272a;
  --border-hover: #fafafa;
}

/* Sepia Theme (Analog Book / E-Reader warm ivory) */
[data-theme="sepia"] {
  --bg-primary: #f4eee1;
  --bg-secondary: #ebdcb9;
  --bg-tertiary: #dfcea5;
  
  --text-primary: #3c2f2f;
  --text-secondary: #5c4a4a;
  --text-muted: #8c7676;
  
  --accent-primary: #b45309; /* Warm Beaver Copper Amber */
  --accent-hover: #d97706;
  
  --border-color: #dfcea5;
  --border-hover: #3c2f2f;
}


/* --- Base Resets --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.625;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

a:hover {
  color: var(--accent-primary);
}

/* --- Header & Navigation --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-container {
  max-width: 840px; /* Highly optimized reading width */
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-link {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.04em;
  text-transform: lowercase;
}

.logo-dot {
  color: var(--accent-primary);
  font-weight: 900;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-link {
  font-weight: 500;
  font-size: 0.92rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  border-bottom: 2px solid var(--accent-primary);
  padding-bottom: 0.2rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Theme Toggle Button - Super Sleek Morph Transition */
.theme-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  width: 2.2rem;
  height: 2.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast);
  position: relative;
}

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

.theme-btn svg {
  width: 1.15rem;
  height: 1.15rem;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: -0.575rem;
  margin-left: -0.575rem;
  transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.4s ease;
}

/* 3-State Theme Switcher Morphing: Light (shows Book) -> Sepia (shows Moon) -> Dark (shows Sun) */

/* Default hidden states */
.theme-btn .moon-icon,
.theme-btn .sun-icon,
.theme-btn .book-icon {
  transform: scale(0) rotate(-90deg);
  opacity: 0;
  pointer-events: none;
}

/* Light Theme: Book is active (clicking goes to Sepia) */
[data-theme="light"] .theme-btn .book-icon {
  transform: scale(1) rotate(0);
  opacity: 1;
  pointer-events: auto;
}

/* Sepia Theme: Moon is active (clicking goes to Dark) */
[data-theme="sepia"] .theme-btn .moon-icon {
  transform: scale(1) rotate(0);
  opacity: 1;
  pointer-events: auto;
}

/* Dark Theme: Sun is active (clicking goes to Light) */
[data-theme="dark"] .theme-btn .sun-icon {
  transform: scale(1) rotate(0);
  opacity: 1;
  pointer-events: auto;
}


/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.5rem;
}

/* --- Layout Container --- */
.main-content {
  flex: 1;
  max-width: 840px;
  width: 100%;
  margin: 0 auto;
  padding: 3.5rem 1.5rem;
}

/* --- Hero Section --- */
.hero-section {
  text-align: left;
  margin-bottom: 3.5rem;
}

.hero-title {
  font-family: var(--font-display);
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.hero-highlight {
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 1.08rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0;
  font-weight: 400;
}

/* --- Digital Garden Explorer --- */
.garden-explorer {
  margin-top: 2rem;
}

/* Search Bar - Understated Minimal Box */
.search-wrapper {
  margin-bottom: 2.5rem;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 0.8rem 1rem 0.8rem 2.5rem;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--border-hover);
}

.search-icon {
  position: absolute;
  left: 0.8rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  width: 1rem;
  height: 1rem;
}

/* Topic Navigation Tabs - Elegant Border Bottom style */
.filter-tabs {
  display: flex;
  justify-content: flex-start;
  gap: 1.75rem;
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.6rem;
  overflow-x: auto;
  scrollbar-width: none; /* Hide scrollbar for clean visual look */
}

.filter-tabs::-webkit-scrollbar {
  display: none;
}

.filter-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.4rem 0;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  position: relative;
  transition: color var(--transition-fast);
}

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

.filter-btn.active {
  color: var(--accent-primary);
  font-weight: 600;
}

.filter-btn.active::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-primary);
}

/* Garden Grid - Editorial Row List (No Cards!) */
.garden-grid {
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* Note Card - Flat Editorial Divider row */
.note-card {
  background-color: transparent;
  border: none;
  border-bottom: 1px solid var(--border-color);
  border-radius: 0;
  padding: 1.75rem 0;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition-fast);
  text-decoration: none;
  cursor: pointer;
  color: var(--text-primary);
}

.note-card:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.5rem;
  font-size: 0.8rem;
}

.note-date {
  color: var(--text-muted);
  font-weight: 500;
}

.note-category {
  color: var(--accent-primary);
  font-family: var(--font-mono);
  font-weight: 600;
  text-transform: lowercase;
  letter-spacing: -0.01em;
}

.note-title {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
  transition: color var(--transition-fast);
}

.note-summary {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  line-height: 1.6;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
}

.read-time {
  color: var(--text-muted);
}

.read-link {
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.2rem;
  border-bottom: 1px solid transparent;
}

.read-link svg {
  width: 0.85rem;
  height: 0.85rem;
  transition: transform var(--transition-fast);
}

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

.note-card:hover .read-link {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
}

.note-card:hover .read-link svg {
  transform: translateX(2px);
  color: var(--accent-primary);
}

/* Empty state styling */
.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-secondary);
  border: 1px dashed var(--border-color);
  border-radius: 4px;
  display: none;
}

/* --- Note/Page View --- */
.note-view-container {
  max-width: 700px;
  margin: 0 auto;
}

.note-meta-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.note-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.note-back-link svg {
  width: 0.9rem;
  height: 0.9rem;
}

.note-back-link:hover {
  color: var(--text-primary);
}

.note-view-title {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  letter-spacing: -0.03em;
}

.note-meta-info {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.meta-item svg {
  width: 0.9rem;
  height: 0.9rem;
}

/* Article Markdown Content Styling */
.note-body {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.note-body p {
  margin-bottom: 1.5rem;
}

.note-body h2 {
  font-family: var(--font-display);
  font-size: 1.65rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.3rem;
  letter-spacing: -0.02em;
}

.note-body h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  margin: 1.75rem 0 0.8rem;
  color: var(--text-primary);
}

.note-body ul, .note-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.note-body li {
  margin-bottom: 0.5rem;
}

.note-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background-color: var(--bg-tertiary);
  padding: 0.1rem 0.3rem;
  border-radius: 2px;
  color: var(--accent-primary);
}

.note-body pre {
  margin: 1.5rem 0;
  padding: 1.25rem;
  border-radius: 4px;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary) !important;
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

.note-body pre code {
  background-color: transparent;
  padding: 0;
  border-radius: 0;
  color: inherit;
}

.note-body blockquote {
  margin: 1.5rem 0;
  padding: 0.5rem 0 0.5rem 1.25rem;
  border-left: 3px solid var(--accent-primary);
  background-color: var(--bg-secondary);
}

.note-body blockquote p {
  margin-bottom: 0;
  color: var(--text-primary);
}

.note-body img {
  max-width: 100%;
  border-radius: 4px;
  margin: 1.5rem 0;
}

/* Wiki-link custom styling */
.note-body a {
  font-weight: 500;
  border-bottom: 1.5px solid var(--accent-primary);
}

.note-body a:hover {
  background-color: var(--bg-tertiary);
}

/* Backlinks Section - Minimal inline style */
.backlinks-section {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px dashed var(--border-color);
  font-size: 0.88rem;
  color: var(--text-muted);
}

.backlinks-label {
  font-weight: 600;
  margin-right: 0.5rem;
  text-transform: lowercase;
  color: var(--text-muted);
}

.backlink-inline {
  color: var(--accent-primary);
  font-weight: 500;
  border-bottom: 1px solid transparent;
}

.backlink-inline:hover {
  border-bottom-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* --- Footer --- */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  padding: 3rem 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-container {
  max-width: 840px;
  margin: 0 auto;
}

.footer-socials {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.social-link {
  color: var(--text-muted);
}

.social-link:hover {
  color: var(--text-primary);
}

.social-link svg {
  width: 1.2rem;
  height: 1.2rem;
}

.footer-copy {
  margin-top: 0.75rem;
}

/* --- Responsive Adjustments --- */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.2rem;
  }
  
  .hero-subtitle {
    font-size: 0.98rem;
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
    gap: 1rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
  }
  
  .nav-menu.open {
    display: flex;
  }
  
  .header-actions {
    margin-left: auto;
    margin-right: 0.5rem;
  }
  
  .note-view-title {
    font-size: 2rem;
  }
}

/* --- Newsletter Section --- */
.newsletter-section {
  margin-top: 5rem;
  padding-top: 3.5rem;
  border-top: 1px solid var(--border-color);
  text-align: left;
}

.newsletter-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
  text-transform: lowercase;
}

.newsletter-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
  max-width: 580px;
}

.newsletter-form {
  display: flex;
  gap: 0.75rem;
  max-width: 480px;
}

.newsletter-input {
  flex: 1;
  padding: 0.75rem 1rem;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  transition: all var(--transition-fast);
}

.newsletter-input:focus {
  outline: none;
  border-color: var(--border-hover);
}

.newsletter-btn {
  padding: 0.75rem 1.5rem;
  background-color: var(--text-primary);
  color: var(--bg-primary);
  border: 1px solid var(--text-primary);
  border-radius: 4px;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  text-transform: lowercase;
  transition: all var(--transition-fast);
}

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

@media (max-width: 580px) {
  .newsletter-form {
    flex-direction: column;
  }
}

/* --- Newsletter thank-you message --- */
.newsletter-msg {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  max-width: 480px;
  margin-top: 1rem;
  padding: 0.9rem 1.1rem;
  border: 1px solid color-mix(in srgb, var(--accent-color) 30%, transparent);
  border-radius: 6px;
  background: color-mix(in srgb, var(--accent-color) 7%, var(--bg-primary));
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--text-primary);
  line-height: 1.5;
  opacity: 0;
  transform: translateY(-6px);
  animation: newsletter-fadein 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.newsletter-msg::before {
  content: '✓';
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  background-color: var(--accent-color);
  color: var(--bg-primary);
  font-size: 0.85rem;
  font-weight: 700;
}

@keyframes newsletter-fadein {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Dark Mode Image Filter (Eye comfort) --- */
[data-theme="dark"] .note-body img {

  filter: brightness(0.82) contrast(1.05);
  transition: filter var(--transition-normal);
}

[data-theme="dark"] .note-body img:hover {
  filter: brightness(1) contrast(1);
}

/* ==========================================================================
   SCROLL PROGRESS BAR
   ========================================================================== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2.5px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-primary), #14b8a6);
  z-index: 1100;
  transition: width 0.1s ease-out;
}

/* ==========================================================================
   KEYBOARD SHORTCUTS MODAL
   ========================================================================== */
/* Shortcuts Modal Container (Slide-up card on bottom-right) */
.shortcut-modal {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 320px;
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.shortcut-modal.open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* Modal Content Card (Ultra-minimalist glassmorphism widget) */
.shortcut-modal-content {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  position: relative;
  text-align: left;
}

/* Close Button */
.shortcut-modal-close {
  position: absolute;
  top: 0.75rem;
  right: 0.85rem;
  font-size: 1.35rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
  line-height: 1;
}

.shortcut-modal-close:hover {
  color: var(--text-primary);
}

/* Modal Header */
.shortcut-modal-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 0;
  margin-bottom: 1.15rem;
  letter-spacing: -0.02em;
  text-transform: lowercase;
}

/* Shortcut Items */
.shortcut-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}

.shortcut-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.shortcut-item kbd {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-bottom: 2px solid var(--border-color);
  border-radius: 3px;
  padding: 0.15rem 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-primary);
  min-width: 32px;
  text-align: center;
  box-shadow: 0 1px 1px rgba(0,0,0,0.03);
}

.shortcut-item span {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* Modal Footer */
.shortcut-modal-footer {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin: 0;
  border-top: 1px solid var(--border-color);
  padding-top: 0.75rem;
  text-align: center;
}

.shortcut-modal-footer kbd {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-bottom: 2px solid var(--border-color);
  border-radius: 3px;
  padding: 0 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-secondary);
}

/* Responsive Mobile sheet drawer transition */
@media (max-width: 600px) {
  .shortcut-modal {
    bottom: 0;
    right: 0;
    left: 0;
    width: 100%;
    transform: translateY(100%);
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  }
  
  .shortcut-modal.open {
    transform: translateY(0);
  }
  
  .shortcut-modal-content {
    border-radius: 12px 12px 0 0;
    border-bottom: none;
    border-left: none;
    border-right: none;
    padding: 1.75rem 1.5rem;
    box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.08);
  }
}

/* ==========================================================================
   INTERACTIVE RELATIONSHIP GRAPH
   ========================================================================== */
.note-graph-wrapper {
  margin-top: 4.5rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border-color);
  text-align: left;
}

.graph-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
  text-transform: lowercase;
}

#note-graph-container {
  width: 100%;
  height: 250px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
  position: relative;
}

/* SVG Elements Styling */
.graph-link {
  stroke: var(--border-color);
  stroke-width: 1.25px;
  stroke-dasharray: 2 2;
  transition: opacity 0.25s ease, stroke 0.25s ease, stroke-width 0.25s ease;
}

.graph-link.dimmed {
  opacity: 0.15;
}

.graph-link.active {
  opacity: 1;
  stroke: var(--accent-primary);
  stroke-width: 2px;
  stroke-dasharray: none;
}

.graph-node {
  cursor: pointer;
  transition: all var(--transition-fast);
}

.graph-node.current {
  fill: var(--accent-primary);
  filter: drop-shadow(0 0 6px var(--accent-primary));
}

.graph-node.neighbor {
  fill: var(--text-muted);
}

.graph-node.neighbor:hover {
  fill: var(--accent-primary);
  r: 8px;
}

.graph-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  fill: var(--text-secondary);
  text-transform: lowercase;
  pointer-events: none;
  user-select: none;
  transition: all var(--transition-fast);
}

.graph-node-group {
  transition: opacity 0.25s ease;
}

.graph-node-group.dimmed {
  opacity: 0.25;
}

.graph-node-group.active {
  opacity: 1;
}

.graph-node-group.active .graph-node {
  r: 8px;
  fill: var(--accent-primary);
  filter: drop-shadow(0 0 8px var(--accent-primary));
}

.graph-node-group.active .graph-label {
  fill: var(--text-primary);
  font-weight: 600;
}

/* Responsive mobile graph styles to hide labels until hovered */
@media (max-width: 600px) {
  .graph-label {
    opacity: 0;
  }
  
  .graph-node-group:hover .graph-label,
  .graph-node-group.active .graph-label {
    opacity: 1;
  }
}


/* --- Offline Page Explorer Layout --- */
.offline-explorer {
  margin-top: 2rem;
  margin-bottom: 2rem;
}

.offline-links-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.offline-link-item {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.offline-link-item:hover {
  transform: translateY(-2px);
  border-color: var(--accent-primary);
}

.offline-article-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem;
  text-decoration: none;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-weight: 500;
}

.offline-icon {
  font-size: 1.25rem;
}

.offline-title {
  text-transform: lowercase;
}

.offline-status, .offline-empty, .offline-error {
  padding: 1.5rem;
  text-align: center;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  background-color: var(--bg-secondary);
  border: 1px dashed var(--border-color);
  border-radius: 6px;
}

/* ==========================================================================
   404 ERROR PAGE STYLING

   ========================================================================== */
.error-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 6rem 1.5rem;
  text-align: center;
  max-width: 580px;
  margin: 0 auto;
}

.error-visual {
  color: var(--accent-primary);
  margin-bottom: 2rem;
}

.error-icon {
  width: 5.5rem;
  height: 5.5rem;
  animation: pulse-slow 3s infinite ease-in-out;
}

@keyframes pulse-slow {
  0%, 100% { transform: scale(1); opacity: 0.95; }
  50% { transform: scale(1.05); opacity: 1; }
}

.error-title {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 1rem 0;
  letter-spacing: -0.05em;
  text-transform: lowercase;
}

.error-subtitle {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 1rem 0;
  line-height: 1.4;
  letter-spacing: -0.02em;
}

.error-message {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin: 0 0 2.5rem 0;
  line-height: 1.6;
}

.error-actions {
  display: flex;
  justify-content: center;
}

.error-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: lowercase;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

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

.error-btn svg {
  width: 1.1rem;
  height: 1.1rem;
  transition: transform var(--transition-fast);
}

.error-btn:hover svg {
  transform: translateX(-4px);
}

/* ==========================================================================
   CODE BLOCK COPY BUTTON
   ========================================================================== */
.code-wrapper {
  position: relative;
  margin: 1.5rem 0;
  border-radius: 4px;
  overflow: visible;
}

.code-wrapper pre {
  margin: 0 !important;
}

.copy-code-btn {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-muted);
  padding: 0.25rem 0.6rem;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  opacity: 0;
  transform: translateY(-2px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  z-index: 10;
  text-transform: lowercase;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.code-wrapper:hover .copy-code-btn {
  opacity: 0.95;
  transform: translateY(0);
}

.copy-code-btn:hover {
  opacity: 1 !important;
  color: var(--text-primary);
  border-color: var(--border-hover);
  background-color: var(--bg-secondary);
}

.copy-code-btn.success {
  background-color: #0f766e;
  border-color: #0f766e;
  color: #ffffff !important;
  opacity: 1 !important;
}
[data-theme="dark"] .copy-code-btn.success {
  background-color: #0d9488;
  border-color: #0d9488;
  color: #ffffff !important;
}

/* ==========================================================================
   BEVER EASTER EGG & TOAST
   ========================================================================== */
.bever-egg {
  cursor: pointer;
  display: inline-block;
  font-size: 1.05rem;
  margin-left: 0.5rem;
  transition: transform var(--transition-normal);
  user-select: none;
  vertical-align: middle;
}

.bever-egg:hover {
  transform: scale(1.22) rotate(-10deg);
}

/* Slide-up Bever Toast Notification */
.bever-toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 320px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem 2.25rem 1.25rem 1.25rem; /* Extra right padding for close button */
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  z-index: 2050;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  text-align: left;
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer; /* Cue to user that clicking it will dismiss it */
}

.bever-toast.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.bever-toast-close {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: none;
  border: none;
  font-size: 1.25rem;
  font-weight: bold;
  color: var(--text-secondary);
  opacity: 0.5;
  cursor: pointer;
  padding: 0.25rem;
  line-height: 1;
  transition: opacity 0.2s ease, color 0.2s ease;
}

.bever-toast-close:hover {
  opacity: 1;
  color: var(--accent-color);
}

/* ==========================================================================
   RELATIONSHIP GRAPH UPGRADES (SVG Hyperlinks)
   ========================================================================== */
.graph-node-link {
  text-decoration: none;
  outline: none;
}

.graph-label {
  pointer-events: auto !important;
  cursor: pointer;
}


/* --- Glassmorphic Command Palette Search button & modal --- */
.search-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.search-btn:hover {
  color: var(--text-primary);
  transform: scale(1.05);
}

.search-btn svg {
  width: 1.15rem;
  height: 1.15rem;
}

.search-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(9, 9, 11, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 10vh 1rem 2rem 1rem;
}

.search-modal.open {
  opacity: 1;
  pointer-events: auto;
}

.search-modal-content {
  width: 100%;
  max-width: 640px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: translateY(-20px) scale(0.98);
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

[data-theme="dark"] .search-modal-content {
  background-color: rgba(20, 20, 22, 0.85);
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(20px);
}

[data-theme="sepia"] .search-modal-content {
  background-color: #f7f2e8;
  border-color: #dfcea5;
}

.search-modal.open .search-modal-content {
  transform: translateY(0) scale(1);
}

.search-modal-header {
  display: flex;
  align-items: center;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  gap: 1rem;
}

[data-theme="dark"] .search-modal-header {
  border-color: rgba(255, 255, 255, 0.08);
}

.search-modal-icon {
  width: 1.35rem;
  height: 1.35rem;
  color: var(--text-muted);
}

.search-modal-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-family: var(--font-sans);
  font-size: 1.15rem;
  color: var(--text-primary);
}

.search-modal-input::placeholder {
  color: var(--text-muted);
}

.search-modal-hints {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.search-hint-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 0.2rem 0.4rem;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-muted);
  text-transform: uppercase;
}

.search-hint-text {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: lowercase;
}

.search-modal-results-container {
  max-height: 50vh;
  overflow-y: auto;
  padding: 0.75rem;
}

.search-modal-results-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.search-status-item {
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.95rem;
}

.search-result-item {
  border-radius: 8px;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
  border: 1px solid transparent;
}

.search-result-link {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 1.25rem;
  text-decoration: none;
  color: inherit;
}

.search-result-item.active {
  background-color: var(--bg-tertiary);
  border-color: var(--border-color);
}

[data-theme="dark"] .search-result-item.active {
  background-color: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.08);
}

.search-result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.search-result-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  text-transform: lowercase;
}

.search-result-category {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-primary);
  background-color: rgba(15, 118, 110, 0.08);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

[data-theme="dark"] .search-result-category {
  background-color: rgba(45, 212, 191, 0.08);
}

.search-result-excerpt {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.4;
  margin-top: 0.15rem;
}

.search-result-excerpt mark {
  background-color: rgba(217, 119, 6, 0.2);
  color: var(--text-primary);
  padding: 0 0.15rem;
  border-radius: 2px;
}

.search-modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0.75rem 1.5rem;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  gap: 1.5rem;
}

[data-theme="dark"] .search-modal-footer {
  background-color: rgba(20, 20, 22, 0.95);
  border-color: rgba(255, 255, 255, 0.05);
}

.search-nav-hint {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.search-nav-hint kbd {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.1rem 0.3rem;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  color: var(--text-muted);
}

/* --- Print Stylesheet (Clean paper & PDF saving) --- */

@media print {
  .site-header, 
  .site-footer, 
  .search-wrapper, 
  .newsletter-section, 
  .note-back-link, 
  .read-link, 
  .backlinks-section, 
  .theme-btn, 
  .mobile-toggle,
  .read-time,
  .scroll-progress,
  .shortcut-modal,
  .note-graph-wrapper,
  .copy-code-btn,
  .bever-egg,
  .bever-toast {
    display: none !important;
  }
}


/* --- Print Stylesheet (Aggressive monochrome reset to fix dark mode printing) --- */
@media print {
  /* Force all variables to high-contrast print mode */
  :root, [data-theme="dark"] {
    --bg-primary: #ffffff !important;
    --bg-secondary: #ffffff !important;
    --bg-tertiary: #ffffff !important;
    --text-primary: #000000 !important;
    --text-secondary: #111111 !important;
    --text-muted: #444444 !important;
    --accent-primary: #000000 !important;
    --border-color: #000000 !important;
  }

  /* Structural hides */
  .site-header, 
  .site-footer, 
  .search-wrapper, 
  .newsletter-section, 
  .note-back-link, 
  .read-link, 
  .backlinks-section, 
  .theme-btn, 
  .mobile-toggle,
  .read-time {
    display: none !important;
  }
  
  /* Hard reset on all text elements to force black ink */
  *, *::before, *::after, body, p, h1, h2, h3, h4, h5, h6, li, span, code, pre, a {
    color: #000000 !important;
    background: transparent !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  body {
    background: #ffffff !important;
    color: #000000 !important;
    font-family: Georgia, serif !important;
    font-size: 12pt !important;
    line-height: 1.525 !important;
  }
  
  .main-content {
    padding: 0 !important;
    max-width: 100% !important;
  }
  
  .note-body {
    font-size: 12pt !important;
    line-height: 1.525 !important;
  }
  
  .note-body a {
    border-bottom: none !important;
    text-decoration: underline !important;
  }
  
  .note-view-title {
    font-size: 24pt !important;
    margin-bottom: 1rem !important;
    letter-spacing: -0.02em !important;
  }
  
  .note-meta-header {
    border-bottom: 1px solid #000000 !important;
    margin-bottom: 2rem !important;
    padding-bottom: 1rem !important;
  }
}