/* ==========================================================================
   1. DESIGN TOKENS & SYSTEM VARIABLES
   ========================================================================== */
:root {
  /* Color Palette - Dark Theme (Default) */
  --bg-body: #0d1117;
  --bg-surface: #161b22;
  --bg-surface-alt: #21262d;
  --bg-sidebar: #0f141c;
  --bg-glass: rgba(13, 17, 23, 0.85);

  --border-color: #30363d;
  --border-subtle: #21262d;
  --border-focus: #58a6ff;

  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --text-inverse: #0d1117;

  /* Brand / Accent Presets */
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --accent-glow: rgba(88, 166, 255, 0.15);

  /* Functional Colors */
  --status-active: #3fb950;
  --color-success: #238636;
  --color-success-bg: rgba(46, 160, 67, 0.15);
  --color-danger: #f85149;
  --color-danger-bg: rgba(248, 81, 73, 0.15);
  --color-warning: #d29922;
  --color-warning-bg: rgba(210, 153, 34, 0.15);
  --color-info: #58a6ff;
  --color-info-bg: rgba(88, 166, 255, 0.15);

  /* Dimensions & Spacing */
  --sidebar-width: 270px;
  --topbar-height: 64px;
  --max-content-width: 1200px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;

  /* Elevation & Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);

  /* Typography */
  --font-sans:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  --font-mono:
    ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono",
    monospace;

  /* Transitions */
  --transition-fast: 0.18s ease;
  --transition-normal: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Overrides (For Settings Appearance Switcher) */
[data-theme="light"] {
  --bg-body: #f6f8fa;
  --bg-surface: #ffffff;
  --bg-surface-alt: #eaeef2;
  --bg-sidebar: #f0f2f5;
  --bg-glass: rgba(246, 248, 250, 0.85);

  --border-color: #d0d7de;
  --border-subtle: #e1e4e8;
  --border-focus: #0969da;

  --text-primary: #1f2328;
  --text-secondary: #57606a;
  --text-muted: #8c959f;
  --text-inverse: #ffffff;

  --accent: #0969da;
  --accent-hover: #0860ca;
  --accent-glow: rgba(9, 105, 218, 0.12);

  --color-success-bg: rgba(31, 136, 61, 0.12);
  --color-danger-bg: rgba(207, 34, 46, 0.12);
  --color-warning-bg: rgba(154, 103, 0, 0.12);
  --color-info-bg: rgba(9, 105, 218, 0.12);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
}

/* ==========================================================================
   2. GLOBAL RESET & BASE HTML ELEMENTS
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.25;
}

h1 {
  font-size: 2.25rem;
}
h2 {
  font-size: 1.75rem;
}
h3 {
  font-size: 1.35rem;
}
h4 {
  font-size: 1.15rem;
}
h5 {
  font-size: 1rem;
}
h6 {
  font-size: 0.875rem;
}

p {
  margin-bottom: var(--space-4);
}

p:last-child {
  margin-bottom: 0;
}

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

ul,
ol {
  list-style: none;
}

code,
kbd,
pre,
samp {
  font-family: var(--font-mono);
  font-size: 0.88em;
}

code {
  background-color: var(--bg-surface-alt);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  color: var(--accent);
  border: 1px solid var(--border-subtle);
}

pre {
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  overflow-x: auto;
  margin-bottom: var(--space-4);
}

pre code {
  background: none;
  padding: 0;
  border: none;
  color: inherit;
}

blockquote {
  border-left: 3px solid var(--accent);
  padding-left: var(--space-4);
  margin: var(--space-4) 0;
  color: var(--text-secondary);
  font-style: italic;
}

hr {
  border: 0;
  border-top: 1px solid var(--border-color);
  margin: var(--space-6) 0;
}

/* ==========================================================================
   3. MEDIA & DOCUMENT CONTAINERS
   ========================================================================== */
img,
video {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

iframe {
  width: 100%;
  border: 0;
  border-radius: var(--radius-md);
}

figure {
  margin-bottom: var(--space-4);
}

figcaption {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: var(--space-2);
}

.aspect-video {
  aspect-ratio: 16 / 9;
  width: 100%;
  object-fit: cover;
}

.aspect-square {
  aspect-ratio: 1 / 1;
  width: 100%;
  object-fit: cover;
}

/* Document & Attachment Badges */
.file-attachment {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  gap: var(--space-3);
  transition: border-color var(--transition-fast);
}

.file-attachment:hover {
  border-color: var(--accent);
}

.file-attachment-info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  overflow: hidden;
}

.file-attachment-icon {
  font-size: 1.5rem;
  color: var(--accent);
}

/* ==========================================================================
   4. FORM CONTROLS & SETTINGS PRIMITIVES (Ready for settings.html)
   ========================================================================== */
input,
select,
textarea,
button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

/* Text Inputs, Selects, and Textareas */
.form-input,
.form-select,
.form-textarea {
  width: 100%;
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.55rem 0.85rem;
  border-radius: var(--radius-sm);
  outline: none;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

.form-helper {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--space-1);
}

/* Toggle Switch */
.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  transition: var(--transition-fast);
  border-radius: var(--radius-full);
}

.switch-slider::before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text-secondary);
  transition: var(--transition-fast);
  border-radius: 50%;
}

.switch input:checked + .switch-slider {
  background-color: var(--accent);
  border-color: var(--accent);
}

.switch input:checked + .switch-slider::before {
  transform: translateX(20px);
  background-color: var(--text-inverse);
}

/* Setting Rows (For configuration lists) */
.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--border-subtle);
  gap: var(--space-4);
}

.setting-row:last-child {
  border-bottom: none;
}

.setting-info {
  display: flex;
  flex-direction: column;
}

.setting-title {
  font-size: 0.95rem;
  font-weight: 600;
}

.setting-description {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   5. BUTTON & ICON COMPONENT SYSTEM
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.6rem 1.15rem;
  font-size: 0.88rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  user-select: none;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.btn:active {
  transform: scale(0.98);
}

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

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

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

.btn-secondary:hover {
  background-color: var(--border-color);
}

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

.btn-danger:hover {
  opacity: 0.9;
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.78rem;
}

.btn-lg {
  padding: 0.85rem 1.6rem;
  font-size: 1rem;
}

.btn-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: inline-grid;
  place-items: center;
  font-size: 1.25rem;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
}

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

/* ==========================================================================
   6. CARDS, BADGES, ALERTS, & TABLES
   ========================================================================== */
/* Cards */
.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
}

.interactive-card {
  transition:
    transform var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.interactive-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-subtle);
  display: grid;
  place-items: center;
  font-size: 1.35rem;
  color: var(--accent);
  margin-bottom: var(--space-3);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.card-text {
  font-size: 0.88rem;
  flex: 1;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  font-weight: 500;
  margin-top: var(--space-4);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.72rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  letter-spacing: 0.02em;
  width: fit-content;
}

.badge-subtle {
  background-color: var(--bg-surface-alt);
  color: var(--text-muted);
}

.badge-accent {
  background-color: var(--accent-glow);
  color: var(--accent);
  border: 1px solid rgba(88, 166, 255, 0.25);
}

.badge-success {
  background-color: var(--color-success-bg);
  color: var(--color-success);
}

.badge-danger {
  background-color: var(--color-danger-bg);
  color: var(--color-danger);
}

/* Alerts / Callouts */
.alert {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  border: 1px solid transparent;
}

.alert-info {
  background-color: var(--color-info-bg);
  border-color: rgba(88, 166, 255, 0.3);
  color: var(--accent);
}

.alert-danger {
  background-color: var(--color-danger-bg);
  border-color: rgba(248, 81, 73, 0.3);
  color: var(--color-danger);
}

/* Tables */
.table-container {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-5);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  text-align: left;
}

.table th,
.table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border-color);
}

.table th {
  background-color: var(--bg-surface-alt);
  color: var(--text-secondary);
  font-weight: 600;
}

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

.table tbody tr:hover {
  background-color: var(--bg-surface);
}

/* ==========================================================================
   7. CORE APP LAYOUT (Sidebar, Topbar, Content, Footer)
   ========================================================================== */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: transform var(--transition-normal);
}

.sidebar-header {
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-avatar {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent), #1f6feb);
  color: #ffffff;
  font-weight: 700;
  font-size: 1rem;
  display: grid;
  place-items: center;
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

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

.close-sidebar-btn {
  display: none;
}

/* Scrollable Sidebar Body */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}

.sidebar-nav::-webkit-scrollbar {
  width: 5px;
}

.sidebar-nav::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: var(--radius-full);
}

.nav-group-title {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 0 0.6rem 0.45rem;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast);
}

.nav-link:hover {
  background-color: var(--bg-surface);
  color: var(--text-primary);
}

.nav-link.active {
  background-color: var(--accent-glow);
  color: var(--accent);
  font-weight: 500;
}

.nav-icon {
  font-size: 1.15rem;
  flex-shrink: 0;
}

.nav-text {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-footer {
  padding: 0.85rem 1rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-sidebar);
  flex-shrink: 0;
}

.user-card {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.user-status-icon {
  color: var(--status-active);
  font-size: 0.65rem;
}

.user-details {
  display: flex;
  flex-direction: column;
}

.user-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
}

.user-role {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* App Wrapper */
.app-wrapper {
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: margin-left var(--transition-normal);
}

body.sidebar-desktop-closed .sidebar {
  transform: translateX(-100%);
}

body.sidebar-desktop-closed .app-wrapper {
  margin-left: 0;
}

/* Topbar */
.topbar {
  height: var(--topbar-height);
  background-color: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
}

.topbar-left,
.topbar-right {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* Main Content Area */
.main-content {
  flex: 1;
  padding: 2.25rem 2rem;
  max-width: var(--max-content-width);
  width: 100%;
  margin: 0 auto;
}

.hero-section {
  background: linear-gradient(
    180deg,
    var(--bg-surface) 0%,
    rgba(22, 27, 34, 0.4) 100%
  );
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem 2.25rem;
  margin-bottom: 2.5rem;
}

.hero-title {
  font-size: 2.3rem;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero-description {
  font-size: 1.05rem;
  max-width: 650px;
  margin-bottom: 1.75rem;
}

.section-container {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.section-header {
  margin-bottom: 0.25rem;
}

.section-title {
  font-size: 1.35rem;
}

.section-subtitle {
  font-size: 0.88rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  background-color: var(--bg-body);
}

/* ==========================================================================
   8. UTILITY CLASSES (Grid, Flexbox, Spacing, Text)
   ========================================================================== */
.flex {
  display: flex;
}
.flex-col {
  flex-direction: column;
}
.flex-wrap {
  flex-wrap: wrap;
}
.items-center {
  align-items: center;
}
.justify-between {
  justify-content: space-between;
}
.justify-center {
  justify-content: center;
}

.gap-1 {
  gap: var(--space-1);
}
.gap-2 {
  gap: var(--space-2);
}
.gap-3 {
  gap: var(--space-3);
}
.gap-4 {
  gap: var(--space-4);
}
.gap-5 {
  gap: var(--space-5);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-4);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}

.text-primary {
  color: var(--text-primary);
}
.text-secondary {
  color: var(--text-secondary);
}
.text-muted {
  color: var(--text-muted);
}
.text-accent {
  color: var(--accent);
}

.mb-1 {
  margin-bottom: var(--space-1);
}
.mb-2 {
  margin-bottom: var(--space-2);
}
.mb-3 {
  margin-bottom: var(--space-3);
}
.mb-4 {
  margin-bottom: var(--space-4);
}
.mb-5 {
  margin-bottom: var(--space-5);
}

.w-full {
  width: 100%;
}

/* ==========================================================================
   9. RESPONSIVE BEHAVIOR & OVERLAYS
   ========================================================================== */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  z-index: 95;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--transition-fast),
    visibility var(--transition-fast);
}

@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .close-sidebar-btn {
    display: grid;
  }

  .app-wrapper {
    margin-left: 0;
  }

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

  body.sidebar-mobile-open .sidebar-overlay {
    opacity: 1;
    visibility: visible;
  }

  .hero-title {
    font-size: 1.85rem;
  }

  .main-content {
    padding: 1.5rem 1.25rem;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   10. FUTURE EXTENSIONS (Append page-specific styles below this line)
   ========================================================================== */
/* ==========================================================================
   10. FUTURE EXTENSIONS: SETTINGS & APPEARANCE SYSTEM
   ========================================================================== */

/* Accent Theme Variants */
:root[data-accent-theme="emerald"] {
  --accent: #2ea043;
  --accent-hover: #3fb950;
  --accent-glow: rgba(46, 160, 67, 0.18);
  --border-focus: #2ea043;
}

:root[data-accent-theme="purple"] {
  --accent: #a371f7;
  --accent-hover: #bc8cff;
  --accent-glow: rgba(163, 113, 247, 0.18);
  --border-focus: #a371f7;
}

:root[data-accent-theme="amber"] {
  --accent: #d29922;
  --accent-hover: #e3b341;
  --accent-glow: rgba(210, 153, 34, 0.18);
  --border-focus: #d29922;
}

/* Settings Page Layout */
.page-title {
  font-size: 2rem;
  margin-bottom: var(--space-2);
}

.settings-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.settings-card {
  padding: var(--space-5);
}

.settings-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: var(--space-2);
}

.settings-header-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  color: var(--accent);
  flex-shrink: 0;
}

/* Theme Switcher Buttons */
.theme-switch-group {
  display: flex;
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 2px;
  gap: 2px;
}

.theme-choice-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.4rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: calc(var(--radius-sm) - 2px);
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast);
}

.theme-choice-btn.active {
  background-color: var(--bg-surface);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

/* Accent Swatches */
.accent-picker {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

.accent-swatch {
  width: 26px;
  height: 26px;
  border-radius: var(--radius-full);
  border: 2px solid transparent;
  cursor: pointer;
  transition:
    transform var(--transition-fast),
    border-color var(--transition-fast);
}

.accent-swatch:hover {
  transform: scale(1.15);
}

.accent-swatch.active {
  border-color: var(--text-primary);
  box-shadow:
    0 0 0 2px var(--bg-surface),
    0 0 8px var(--accent);
}

.swatch-blue {
  background-color: #58a6ff;
}
.swatch-emerald {
  background-color: #2ea043;
}
.swatch-purple {
  background-color: #a371f7;
}
.swatch-amber {
  background-color: #d29922;
}

/* Metrics Panel for Local Cache */
.storage-metrics-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-3);
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: var(--space-4);
}

.metric-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.metric-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}

.metric-value {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Notification Toast */
.settings-feedback-toast {
  position: fixed;
  bottom: var(--space-5);
  right: var(--space-5);
  background-color: var(--bg-surface);
  border: 1px solid var(--accent);
  color: var(--text-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.88rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition:
    opacity var(--transition-fast),
    transform var(--transition-fast),
    visibility var(--transition-fast);
  z-index: 200;
}

.settings-feedback-toast i {
  color: var(--accent);
  font-size: 1.1rem;
}

.settings-feedback-toast.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ==========================================================================
   10. FUTURE EXTENSIONS: DYNAMIC CATALOG & ARCHIVE SYSTEM
   ========================================================================== */

/* Catalog Toolbar */
.catalog-toolbar {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.catalog-search-box {
  position: relative;
  width: 100%;
  max-width: 580px;
}

.catalog-search-box .search-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
  pointer-events: none;
}

.catalog-search-box .search-input {
  padding-left: 2.5rem;
  padding-right: 2.25rem;
  height: 42px;
  font-size: 0.9rem;
}

.search-clear-btn {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.search-clear-btn.visible {
  display: flex;
}

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

/* Tag Filter Chips */
.tag-filter-container {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  overflow-x: auto;
  padding-bottom: var(--space-2);
  scrollbar-width: thin;
}

.tag-chip {
  padding: 0.35rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  white-space: nowrap;
  cursor: pointer;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
}

.tag-chip:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.tag-chip.active {
  background-color: var(--accent-glow);
  border-color: var(--accent);
  color: var(--accent);
}

/* Catalog Card Structure */
.catalog-card {
  justify-content: space-between;
  height: 100%;
}

.catalog-card-header {
  display: flex;
  flex-direction: column;
}

.card-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

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

.card-chips {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.card-title-link {
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

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

.catalog-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-subtle);
  gap: var(--space-2);
}

.card-tags-group {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.card-tag {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.card-actions-group {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.card-action-icon {
  width: 30px;
  height: 30px;
  font-size: 1.05rem;
}

/* Empty State */
.catalog-empty-state {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-7) var(--space-4);
  background-color: var(--bg-surface);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-lg);
  margin: var(--space-4) 0;
}

.catalog-empty-state.visible {
  display: flex;
}

.empty-icon {
  font-size: 2.5rem;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}

.empty-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-2);
}

.empty-subtitle {
  font-size: 0.9rem;
  max-width: 420px;
  margin-bottom: var(--space-4);
}

/* ==========================================================================
   10. FUTURE EXTENSIONS: SINGLE ENTRY, EDITORIAL & PROSE SYSTEM
   ========================================================================== */

/* Main Entry Wrapper (Optimized for readability) */
.entry-container {
  max-width: 820px;
  margin: 0 auto;
  width: 100%;
}

.entry-back-bar {
  display: flex;
  align-items: center;
}

.entry-back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition:
    color var(--transition-fast),
    transform var(--transition-fast);
}

.entry-back-link:hover {
  color: var(--accent);
  transform: translateX(-3px);
}

.entry-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: var(--space-5);
}

.entry-series-tag {
  display: flex;
  align-items: center;
}

.entry-title {
  font-size: 2.35rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.entry-meta-strip {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.entry-meta-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

/* Table of Contents Box */
.toc-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
}

.toc-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.toc-list a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.toc-list a:hover {
  color: var(--accent);
}

/* Editorial Prose & Body Typography */
.prose {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.prose .lead-text {
  font-size: 1.2rem;
  line-height: 1.65;
  color: var(--text-secondary);
  margin-bottom: var(--space-5);
}

.prose h2 {
  font-size: 1.55rem;
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-subtle);
}

.prose h3 {
  font-size: 1.25rem;
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
}

.prose p {
  margin-bottom: var(--space-4);
}

.prose strong {
  color: var(--text-primary);
}

.ordered-list {
  list-style: decimal inside;
  margin-left: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.ordered-list li {
  padding-left: var(--space-1);
}

/* Reusable Callout Containers */
.callout {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
}

.callout-icon {
  font-size: 1.4rem;
  flex-shrink: 0;
  line-height: 1.2;
}

.callout-heading {
  font-size: 0.98rem;
  margin-bottom: var(--space-1);
}

.callout-text {
  font-size: 0.92rem;
  margin-bottom: 0;
  line-height: 1.6;
}

.callout-info {
  background-color: var(--color-info-bg);
  border-color: rgba(88, 166, 255, 0.25);
  color: var(--text-primary);
}

.callout-info .callout-icon,
.callout-info .callout-heading {
  color: var(--accent);
}

.callout-warning {
  background-color: var(--color-warning-bg);
  border-color: rgba(210, 153, 34, 0.25);
  color: var(--text-primary);
}

.callout-warning .callout-icon,
.callout-warning .callout-heading {
  color: var(--color-warning);
}

/* Reusable Code Frame with Copy Button */
.code-frame {
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
}

.code-language {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.code-copy-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.78rem;
  color: var(--text-secondary);
  background: transparent;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
}

.code-copy-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface-alt);
}

.code-frame pre {
  border: none;
  border-radius: 0;
  margin-bottom: 0;
  padding: var(--space-4);
  overflow-x: auto;
}

/* Reusable Key Takeaway Card */
.takeaway-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
}

.takeaway-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: var(--space-2);
}

.takeaway-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* Tags & Taxonomy Row */
.entry-tags-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-subtle);
}

/* Author Bio Card */
.author-bio-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--accent), #1f6feb);
  color: #ffffff;
  font-weight: 700;
  font-size: 1.25rem;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.author-info {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.author-bio-text {
  font-size: 0.88rem;
  line-height: 1.6;
  margin-bottom: var(--space-3);
}

.author-links {
  font-size: 0.85rem;
  font-weight: 500;
}

/* Entry Pagination (Previous/Next) */
.entry-pagination {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.entry-page-link {
  display: flex;
  flex-direction: column;
  padding: var(--space-4);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition:
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.entry-page-link:hover:not(.is-disabled) {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.entry-page-link.is-disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.page-direction {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.page-target-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* Spacing Utilities */
.my-5 {
  margin-top: var(--space-5);
  margin-bottom: var(--space-5);
}

@media (max-width: 768px) {
  .entry-title {
    font-size: 1.85rem;
  }

  .prose {
    font-size: 1rem;
  }

  .author-bio-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .entry-pagination {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   10. FUTURE EXTENSIONS: RICH MEDIA, EDITORIAL FIGURES & ACCORDIONS
   ========================================================================== */

/* Figures & Captions */
.media-figure {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.figure-image-wrapper {
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
}

.figure-image-wrapper img {
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.figure-image-wrapper:hover img {
  transform: scale(1.02);
}

.figure-caption {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.5;
}

/* Audio Player Card */
.media-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

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

.media-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
}

.custom-audio-element {
  width: 100%;
  height: 40px;
  border-radius: var(--radius-sm);
  outline: none;
}

.custom-audio-element::-webkit-media-controls-panel {
  background-color: var(--bg-surface-alt);
}

.media-card-footer {
  font-size: 0.75rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-2);
}

/* Video Player Card */
.video-card {
  padding: 0;
  overflow: hidden;
}

.video-container {
  position: relative;
  width: 100%;
  background-color: #000000;
  aspect-ratio: 16 / 9;
}

.video-container video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 0;
}

.video-details {
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.video-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.video-title {
  font-size: 1rem;
  font-weight: 600;
}

.video-desc {
  font-size: 0.85rem;
  line-height: 1.5;
}

/* Blockquotes with Citations */
.prose-quote {
  border-left: 3px solid var(--accent);
  padding: var(--space-4) var(--space-5);
  background-color: var(--bg-surface);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: var(--space-5) 0;
}

.prose-quote p {
  font-size: 1.15rem;
  font-style: italic;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.prose-quote cite {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-style: normal;
  font-weight: 500;
}

/* Task Checklists */
.checklist {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  list-style: none;
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  font-size: 0.92rem;
  line-height: 1.6;
}

.checklist-icon {
  font-size: 1.25rem;
  color: var(--status-active);
  flex-shrink: 0;
  margin-top: 2px;
}

/* Downloadable Attachments Grid */
.downloads-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-3);
}

.file-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

/* Details / Accordion Stack */
.accordion-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.accordion-item {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.accordion-item[open] {
  border-color: var(--accent);
}

.accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.accordion-header::-webkit-details-marker {
  display: none;
}

.accordion-arrow {
  font-size: 1.25rem;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
}

.accordion-item[open] .accordion-arrow {
  transform: rotate(180deg);
  color: var(--accent);
}

.accordion-body {
  padding: 0 var(--space-4) var(--space-4);
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   10. FUTURE EXTENSIONS: CONTENT BUILDER STUDIO
   ========================================================================== */

/* Topbar Indicator */
.builder-status-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8rem;
  color: var(--text-muted);
  background-color: var(--bg-surface-alt);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--status-active);
}

/* Tabs Bar */
.builder-tabs-bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: var(--space-2);
  overflow-x: auto;
  scrollbar-width: thin;
}

.builder-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.6rem 1.1rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast);
}

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

.builder-tab-btn.active {
  background-color: var(--bg-surface);
  color: var(--accent);
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

/* Tab Panels */
.builder-tab-panel {
  display: none;
}

.builder-tab-panel.active {
  display: block;
}

/* Metadata Editor */
.metadata-editor-card {
  border: 1px solid var(--border-color);
}

.metadata-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  cursor: pointer;
  user-select: none;
}

.metadata-body {
  padding: 0 var(--space-4) var(--space-4);
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-4);
}

/* Block Insertion Palette */
.block-palette-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.palette-title {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}

.palette-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.palette-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.45rem 0.8rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-primary);
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition:
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
}

.palette-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

.palette-btn i {
  font-size: 1rem;
}

/* Canvas Block Cards */
.canvas-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.block-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition:
    box-shadow var(--transition-fast),
    border-color var(--transition-fast);
}

.block-card.dragging {
  opacity: 0.4;
  border-style: dashed;
}

.block-card:focus-within {
  border-color: var(--border-focus);
}

.block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-3);
  background-color: var(--bg-surface-alt);
  border-bottom: 1px solid var(--border-color);
  user-select: none;
}

.block-drag-handle {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: grab;
}

.block-drag-handle:active {
  cursor: grabbing;
}

.block-actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.block-action-btn {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  font-size: 0.95rem;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
}

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

.block-action-btn.delete-btn:hover {
  color: var(--color-danger);
}

.block-body {
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

/* Preview Viewport & Wrapper */
.preview-viewport-wrapper {
  background-color: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-5);
  min-height: 500px;
}

/* Output Code & Actions Bar */
.output-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.output-info {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.output-filename {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
}

.text-sm {
  font-size: 0.8rem;
}

/* ==========================================================================
   10. FUTURE EXTENSIONS: CONTENT STUDIO & INDEXEDDB MANAGER
   ========================================================================== */

/* Layout with Sticky Bottom Bar */
.app-wrapper.has-bottom-bar {
  padding-bottom: 74px;
}

/* Topbar Project Badge */
.header-project-badge {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.88rem;
  max-width: 320px;
}

.truncate-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.file-upload-label {
  cursor: pointer;
  margin-bottom: 0;
}

/* Project Manager Cards Grid */
.project-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: var(--space-4);
}

.project-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition:
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.project-card.is-active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.project-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.project-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: var(--space-1);
  color: var(--text-primary);
}

.project-card-date {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.project-card-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  margin-top: var(--space-3);
  border-top: 1px solid var(--border-subtle);
}

/* Sticky Bottom Action Bar */
.builder-bottom-bar {
  position: fixed;
  bottom: 0;
  left: var(--sidebar-width);
  right: 0;
  height: 64px;
  background-color: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  z-index: 90;
  transition: left var(--transition-normal);
}

body.sidebar-desktop-closed .builder-bottom-bar {
  left: 0;
}

@media (max-width: 900px) {
  .builder-bottom-bar {
    left: 0;
    padding: 0 1rem;
  }

  .hide-mobile {
    display: none;
  }
}

.bottom-bar-left,
.bottom-bar-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.bottom-bar-center {
  display: flex;
  align-items: center;
  max-width: 300px;
}

.bottom-project-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.save-status-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.save-status-indicator .status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--status-active);
  transition: background-color var(--transition-fast);
}

.save-status-indicator .status-dot.unsaved {
  background-color: var(--color-warning);
}

/* ==========================================================================
   10. FUTURE EXTENSIONS: TIMELESS EDITORIAL & NARRATIVE COMPONENTS
   ========================================================================== */

/* Palette Categories in Builder */
.palette-category {
  margin-bottom: var(--space-4);
}

.palette-category:last-child {
  margin-bottom: 0;
}

.palette-category-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

/* 1. Terminal Console Component */
.terminal-block {
  background-color: #05070a;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: var(--space-5) 0;
  font-family: var(--font-mono);
}

.terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-3);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
}

.terminal-dots {
  display: flex;
  align-items: center;
  gap: 6px;
}

.terminal-dot-ui {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--border-color);
}

.terminal-title {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.terminal-body {
  padding: var(--space-4);
  font-size: 0.88rem;
  line-height: 1.65;
  overflow-x: auto;
}

.terminal-prompt-line {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--accent);
}

.terminal-prompt-sym {
  color: var(--status-active);
  font-weight: 700;
  user-select: none;
}

.terminal-output {
  color: var(--text-secondary);
  margin-top: var(--space-2);
  white-space: pre-wrap;
}

/* 2. Metrics & Stat Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-3);
  margin: var(--space-5) 0;
}

.metric-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.metric-val {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.1;
  margin-bottom: var(--space-1);
  letter-spacing: -0.02em;
}

.metric-lbl {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* 3. Step-by-Step Vertical Timeline */
.timeline-stack {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  margin: var(--space-5) 0;
  padding-left: var(--space-5);
  border-left: 2px solid var(--border-subtle);
}

.timeline-step {
  position: relative;
}

.timeline-marker {
  position: absolute;
  left: calc(-1 * var(--space-5) - 7px);
  top: 3px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--accent);
  border: 3px solid var(--bg-body);
}

.timeline-step-meta {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.timeline-step-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.timeline-step-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 4. Dialogue & Script Line (Podcasts & Visual Novels) */
.dialogue-block {
  display: flex;
  gap: var(--space-4);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  margin: var(--space-4) 0;
}

.dialogue-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background-color: var(--bg-surface-alt);
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent);
  flex-shrink: 0;
  border: 1px solid var(--border-subtle);
}

.dialogue-body {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.dialogue-speaker-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
}

.dialogue-text {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 5. Character & Dossier Profile */
.character-dossier {
  display: grid;
  grid-template-columns: 200px 1fr;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: var(--space-5) 0;
}

@media (max-width: 700px) {
  .character-dossier {
    grid-template-columns: 1fr;
  }
}

.dossier-portrait {
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
  background-color: var(--bg-surface-alt);
  border-right: 1px solid var(--border-subtle);
}

@media (max-width: 700px) {
  .dossier-portrait {
    max-height: 250px;
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }
}

.dossier-info {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-2);
}

.dossier-name {
  font-size: 1.35rem;
  font-weight: 700;
}

.dossier-role {
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.dossier-quote {
  font-style: italic;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-left: 2px solid var(--border-color);
  padding-left: var(--space-3);
  margin: var(--space-2) 0;
}

.dossier-bio {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 6. Side-by-Side Dual Image Grid */
.image-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  margin: var(--space-5) 0;
}

@media (max-width: 640px) {
  .image-grid-2 {
    grid-template-columns: 1fr;
  }
}

/* 7. Changelog & Release Notes */
.changelog-block {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-5) 0;
}

.changelog-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.changelog-version {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background-color: var(--accent-glow);
  color: var(--accent);
  border: 1px solid rgba(88, 166, 255, 0.3);
}

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

.changelog-list {
  list-style: disc inside;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: 0.92rem;
  color: var(--text-secondary);
}

/* 8. Interactive Web Embed (Itch.io / YouTube / Audio) */
.embed-frame-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: #000000;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: var(--space-5) 0;
}

.embed-frame-container iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

/* 9. Call to Action (CTA) Showcase */
.cta-banner {
  background: linear-gradient(
    135deg,
    var(--bg-surface) 0%,
    var(--bg-surface-alt) 100%
  );
  border: 1px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-5);
  text-align: center;
  margin: var(--space-6) 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.cta-title {
  font-size: 1.45rem;
  font-weight: 700;
}

.cta-desc {
  max-width: 550px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* 10. Minimalist Scene Divider */
.scene-divider {
  border: 0;
  text-align: center;
  margin: var(--space-7) 0;
  position: relative;
}

.scene-divider::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--border-color),
    transparent
  );
}

.scene-divider-symbol {
  position: relative;
  display: inline-block;
  padding: 0 var(--space-4);
  background-color: var(--bg-body);
  color: var(--text-muted);
  font-size: 1.1rem;
  letter-spacing: 0.3em;
}

/* ==========================================================================
   10. FUTURE EXTENSIONS: CONTACT CHANNEL COMPONENT
   ========================================================================== */

.contact-channel-card {
  padding: var(--space-5);
}

.contact-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: var(--space-4);
}

.email-display-container {
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.email-address-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.email-at-icon {
  font-size: 1.35rem;
  color: var(--accent);
}

.email-address-text {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  word-break: break-all;
}

.email-actions-group {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.contact-notes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-subtle);
}

.contact-note-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: 0.88rem;
  line-height: 1.5;
}

.contact-note-item i {
  font-size: 1.2rem;
  margin-top: 2px;
  flex-shrink: 0;
}

.text-sm {
  font-size: 0.8rem;
}

@media (max-width: 680px) {
  .contact-card-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .email-display-container {
    flex-direction: column;
    align-items: flex-start;
  }

  .email-actions-group {
    width: 100%;
  }

  .email-actions-group .btn {
    flex: 1;
    justify-content: center;
  }
}

/* ==========================================================================
   10. FUTURE EXTENSIONS: AGE VERIFICATION GATE (18+)
   ========================================================================== */

body.age-gate-active {
  overflow: hidden !important;
}

.age-gate-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(5, 7, 10, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  animation: fadeIn var(--transition-fast) ease-out forwards;
}

.age-gate-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.55);
  max-width: 480px;
  width: 100%;
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  text-align: center;
}

.age-gate-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.age-gate-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-danger);
  background-color: rgba(248, 81, 73, 0.12);
  border: 1px solid rgba(248, 81, 73, 0.28);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
}

.age-gate-title {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.age-gate-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-2);
}

.age-gate-subtext {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.age-gate-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding-top: var(--space-2);
}

@media (max-width: 480px) {
  .age-gate-actions {
    flex-direction: column;
    width: 100%;
  }

  .age-gate-actions .btn {
    width: 100%;
  }
}