/* =================================================================
   BASE.CSS - Foundation Styles for MarkTide Viewer
   
   This file contains all the base styles that are theme-independent:
   - CSS Reset and universal styles
   - Layout structure and positioning
   - Typography foundations
   - Component structure without colors
   ================================================================= */

/* =================================================================
   1. CSS RESET & UNIVERSAL STYLES
   ================================================================= */

/* Utility Classes */
.visually-hidden {
  display: none !important;
}

  * {
   box-sizing: border-box;
   margin: 0;
   padding: 0;
  }
  
  html, body {
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
  }

  :root {
    --menu-ease: cubic-bezier(0.16, 1, 0.3, 1);
    --menu-panel-width: 334px;
    --mobile-menu-content-width: 272px;
  }

  /* Keep page scrollbars fully hidden while loader is active (all browsers). */
  html.loading-active,
  body.loading-active {
    overflow: hidden !important;
    scrollbar-width: none !important; /* Firefox */
    -ms-overflow-style: none !important; /* Legacy Edge/IE */
  }

  html.loading-active::-webkit-scrollbar,
  body.loading-active::-webkit-scrollbar {
    width: 0 !important;
    height: 0 !important;
    display: none !important;
  }
  
  /* =================================================================
     2. BASE LAYOUT & BODY
     ================================================================= */
  
  body {
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  }

  body.menu-open {
    overflow: hidden;
  }
  
  /* =================================================================
     3. LOADING SCREEN COMPONENTS
     ================================================================= */
  
  .loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
  }
  
  .loading-screen.fade-out {
    opacity: 0;
    visibility: hidden;
  }
  
  .loading-content {
    text-align: center;
    color: white;
    background: rgba(255, 255, 255, 0.05);
    padding: 3rem;
    border-radius: 20px;
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    animation: contentFloat 3s ease-in-out infinite;
  }
  
  .loading-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 2rem;
  }
  
  .logo-animation {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: logoFloat 2s ease-in-out infinite, logoGlow 2s ease-in-out infinite;
  }
  
  .loading-text {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  .loading-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: 2px;
    animation: titleSlide 1s ease-out 0.5s both;
  }
  
  .loading-subtitle {
    font-size: 1.2rem;
    font-weight: 300;
    opacity: 0.9;
    animation: subtitleSlide 1s ease-out 0.8s both;
  }
  
  .loading-progress {
    width: 300px;
    height: 6px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    overflow: hidden;
    margin: 0 auto;
    -webkit-backdrop-filter: blur(5px);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  .progress-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--text-color), #f0f8ff, var(--text-color));
    border-radius: 10px;
    animation: progressFill 2s ease-in-out forwards;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
    position: relative;
  }
  
  .progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: progressShine 1.5s ease-in-out infinite;
  }
  
  .loading-designer {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.8);
    letter-spacing: 1px;
    opacity: 0;
    transform: translateY(15px) scale(0.9);
    animation: designerFadeIn 1s ease-out 0.8s both, designerPulse 2s ease-in-out 2.1s infinite;
  }
  
  /* =================================================================
     4. APP STRUCTURE & MAIN CONTAINERS
     ================================================================= */
  
  .app-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
  }
  
  .content-container {
    display: flex;
    flex: 1;
    overflow: hidden; /* default: no page scroll */
    transition: all 0.3s ease;
    min-height: 0;
  }

  /* In editor-only, keep split-like flex sizing so header/dropzone consume real space */
  body.editor-only-active .content-container {
    height: auto;
    flex: 1 1 auto;
    min-height: 0;
    overflow: hidden;
  }

  /* In preview-only, let document scroll from the top (no clamping) */
  body.preview-only-active .content-container {
    height: auto;
  }

  /* Expose header height as a CSS var; updated via JS compute path */
  .app-header { --header-height: 0px; }
  
  /* =================================================================
     5. HEADER COMPONENTS
     ================================================================= */
  
  .app-header {
    background: linear-gradient(135deg, var(--header-bg) 0%, var(--header-gradient) 100%);
    border-bottom: 1px solid var(--border-color);
    padding: 0;
    transition: all 0.3s ease;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  }
  
  .header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    padding: 0.75rem 2rem;
    max-width: none;
  }
  
  /* --- Header Brand Section --- */
  .header-brand {
    display: flex;
    align-items: center;
    gap: 1.5rem;
  }
  
  .logo-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.3s ease;
  }
  
  .logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(79, 195, 247, 0.1);
    border: 1px solid rgba(79, 195, 247, 0.3);
    border-radius: 12px;
    color: var(--accent-color);
    font-size: 1.25rem;
    font-weight: 700;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    box-shadow: 0 4px 12px rgba(79, 195, 247, 0.2);
    transition: all 0.3s ease;
  }
  
  .logo-icon:hover {
    background: rgba(79, 195, 247, 0.15);
    border-color: rgba(79, 195, 247, 0.5);
    box-shadow: 0 6px 20px rgba(79, 195, 247, 0.3);
    transform: translateY(-1px);
  }
  
  .brand-info {
    display: flex;
    flex-direction: column;
    line-height: 1;
  }
  
  .brand-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
    color: var(--text-color);
    letter-spacing: -0.02em;
    transition: all 0.3s ease;
  }
  
  .brand-title:hover {
    color: var(--accent-color);
    text-shadow: 0 0 10px rgba(79, 195, 247, 0.3);
  }
  
  .brand-subtitle {
    font-size: 0.875rem;
    color: var(--text-color);
    opacity: 0.7;
    font-weight: 500;
    margin-top: 2px;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    flex-wrap: wrap;
  }
  
  .brand-subtitle:hover {
    opacity: 1;
    color: var(--accent-color);
  }

  .app-version-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.14rem 0.48rem;
    border-radius: 999px;
    border: 1px solid color-mix(in srgb, var(--accent-color) 40%, var(--border-color));
    background: color-mix(in srgb, var(--accent-color) 10%, transparent);
    color: color-mix(in srgb, var(--accent-color) 88%, var(--text-color));
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    line-height: 1;
    white-space: nowrap;
    opacity: 1;
    box-shadow: 0 1px 8px rgba(79, 195, 247, 0.12);
  }
  
  .header-divider {
    width: 1px;
    height: 32px;
    background: var(--border-color);
    opacity: 0.5;
  }
  
  .github-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--button-bg);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    color: var(--text-color);
    text-decoration: none;
    transition: all 0.2s ease;
    font-size: 0.875rem;
    font-weight: 500;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
  }
  
  .github-badge:hover {
    background: var(--button-hover);
    color: var(--text-color);
    transform: translateY(-1px);
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }
  
  .github-text {
    display: none;
  }
  
  /* --- Header Actions Section --- */
  .header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
  }
  
  .action-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    background: var(--button-bg);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    color: var(--text-color);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
  }
  
  .action-btn:hover {
    background: var(--button-hover);
    transform: translateY(-1px);
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }
  
  .action-btn.sync-enabled {
    background: var(--button-hover);
    color: var(--text-color);
    border-color: var(--accent-color);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }
  
  .action-btn.sync-enabled:hover {
    background: var(--button-hover);
    transform: translateY(-2px);
    border-color: var(--accent-color);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
  }
  
  .action-btn.sync-disabled {
    border-color: rgba(255, 255, 255, 0.3);
    background: var(--button-bg);
  }
  
  .action-btn.sync-disabled:hover {
    background: var(--button-hover);
    transform: translateY(-1px);
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }
  
  /* --- View Controls --- */
  .view-controls {
    display: flex;
    background: var(--button-bg);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    overflow: hidden;
    transition: all 0.2s ease;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
  }
  
  .view-controls:hover {
    border-color: var(--accent-color);
  }
  
  .view-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1rem;
  }
  
  .view-btn:hover {
    background: var(--button-hover);
    color: var(--text-color);
  }
  
  .view-btn.active {
    background: var(--button-hover);
    color: var(--text-color);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
  }
  
  .view-btn + .view-btn {
    border-left: 1px solid rgba(255, 255, 255, 0.2);
  }
  
  /* --- Utility Controls --- */
  .utility-group {
    display: flex;
    gap: 0.5rem;
  }
  
  .utility-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--button-bg);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1rem;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
  }
  
  .utility-btn:hover {
    background: var(--button-hover);
    transform: translateY(-1px);
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }

  .utility-btn.active {
    background: var(--button-hover);
    border-color: var(--accent-color);
    color: var(--accent-color);
    box-shadow: 0 2px 8px rgba(79, 195, 247, 0.2);
  }

  .utility-btn.active:hover {
    background: var(--button-hover);
    transform: translateY(-1px);
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(79, 195, 247, 0.3);
  }
  
  /* =================================================================
     6. MOBILE COMPONENTS
     ================================================================= */
  
  /* --- Mobile Toggle --- */
  .mobile-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    background: linear-gradient(
      180deg,
      color-mix(in srgb, var(--button-bg) 88%, #ffffff 12%),
      color-mix(in srgb, var(--button-bg) 94%, #000000 6%)
    );
    border: 1px solid color-mix(in srgb, var(--border-color) 78%, transparent);
    border-radius: 6px;
    color: var(--text-color);
    cursor: pointer;
    box-shadow:
      inset 0 1px 0 rgba(255, 255, 255, 0.12),
      0 4px 12px rgba(0, 0, 0, 0.22);
    transition:
      transform 0.45s var(--menu-ease),
      box-shadow 0.45s var(--menu-ease),
      background 0.45s var(--menu-ease),
      border-color 0.45s var(--menu-ease),
      color 0.45s var(--menu-ease);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    overflow: hidden;
    position: relative;
  }

  .mobile-toggle.hamburger {
    padding: 0;
  }

  .mobile-toggle:active {
    transform: scale(0.96);
  }

  .mobile-toggle.is-active {
    color: var(--accent-color);
    border-color: color-mix(in srgb, var(--accent-color) 72%, var(--border-color));
    background: linear-gradient(
      180deg,
      color-mix(in srgb, var(--button-bg) 75%, var(--accent-color) 25%),
      color-mix(in srgb, var(--button-bg) 85%, var(--accent-color) 15%)
    );
    box-shadow:
      inset 0 1px 0 rgba(255, 255, 255, 0.24),
      0 0 0 1px color-mix(in srgb, var(--accent-color) 55%, transparent),
      0 12px 30px rgba(0, 0, 0, 0.32);
  }

  .mobile-toggle::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, transparent 0%, rgba(255, 255, 255, 0.28) 45%, transparent 100%);
    transform: translateX(-140%);
    transition: transform 0.7s var(--menu-ease);
    pointer-events: none;
  }

  .mobile-toggle.is-active::after {
    transform: translateX(140%);
  }

  .mobile-toggle .hamburger-box {
    width: 20px;
    height: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .mobile-toggle .hamburger-inner,
  .mobile-toggle .hamburger-inner::before,
  .mobile-toggle .hamburger-inner::after {
    width: 20px;
    height: 2px;
    border-radius: 999px;
    background-color: currentColor;
    transition-timing-function: var(--menu-ease);
    transition-duration: 0.45s;
  }

  .mobile-toggle .hamburger-inner::before {
    top: -6px;
  }

  .mobile-toggle .hamburger-inner::after {
    top: 6px;
  }
  
  .mobile-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-color);
  }

  .mobile-header-main {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    min-width: 0;
  }

  .mobile-brand-icon {
    width: 40px;
    height: 40px;
    border: 1px solid rgba(79, 195, 247, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
    background: rgba(79, 195, 247, 0.1);
    box-shadow: 0 4px 12px rgba(79, 195, 247, 0.2);
    border-radius: 12px;
    font-size: 1.25rem;
    font-weight: 700;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    transition: all 0.3s ease;
  }

  .mobile-brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
  }

  .mobile-brand-title {
    font-size: 1.55rem;
    font-weight: 800;
    letter-spacing: -0.02em;
  }

  .mobile-brand-subtitle {
    font-size: 0.74rem;
    color: color-mix(in srgb, var(--text-color) 68%, transparent);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    flex-wrap: wrap;
  }

  .mobile-version-badge {
    font-size: 0.62rem;
    padding: 0.13rem 0.42rem;
    box-shadow: none;
  }

  .mobile-github-btn {
    width: 40px;
    height: 40px;
    margin-left: 0;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    background: color-mix(in srgb, var(--button-bg) 86%, transparent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.05);
    border-radius: 10px;
  }

  .mobile-close-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    background: color-mix(in srgb, var(--button-bg) 86%, transparent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    padding: 0;
    line-height: 1;
  }

  .mobile-stats-line {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    font-size: 1rem;
    color: color-mix(in srgb, var(--text-color) 84%, transparent);
    border-top: 1px solid color-mix(in srgb, var(--border-color) 85%, transparent);
    border-bottom: 1px solid color-mix(in srgb, var(--border-color) 85%, transparent);
    padding: 0.85rem 0.15rem;
    margin-bottom: 0.75rem;
    font-weight: 500;
  }

  .mobile-stats-token {
    color: color-mix(in srgb, var(--text-color) 72%, transparent);
    font-size: 0.95rem;
    letter-spacing: 0.01em;
  }
  
  /* --- Mobile Menu Items --- */
  .mobile-menu-item {
    background: color-mix(in srgb, var(--button-bg) 90%, transparent);
    border: 1px solid color-mix(in srgb, var(--border-color) 90%, transparent);
    color: var(--text-color);
    border-radius: 9px;
    padding: 0.78rem 0.95rem;
    font-size: 0.95rem;
    font-weight: 500;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 0.65rem;
    transition: transform 0.25s var(--menu-ease), box-shadow 0.25s var(--menu-ease), border-color 0.25s var(--menu-ease), background-color 0.25s var(--menu-ease), color 0.25s var(--menu-ease);
    width: 100%;
    position: relative;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
  }

  .mobile-menu-item i {
    font-size: 1rem;
    color: color-mix(in srgb, var(--text-color) 88%, transparent);
  }

  .mobile-menu-arrow {
    margin-left: auto;
    font-size: 1.05rem;
    line-height: 1;
    color: color-mix(in srgb, var(--text-color) 70%, transparent);
  }

  .mobile-menu-item.dropdown-toggle::after {
    display: none !important;
  }
  
  .mobile-menu-item:hover {
    background: var(--button-hover);
    transform: translateY(-1px);
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }
  
  .mobile-menu-item:active {
    background-color: var(--button-active);
    transform: translateY(0px);
  }
  
  .mobile-menu-item.sync-enabled {
    background: var(--button-hover);
    color: var(--text-color);
    border-color: var(--accent-color);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }
  
  .mobile-menu-item.sync-enabled:hover {
    background: var(--button-hover);
    transform: translateY(-2px);
    border-color: var(--accent-color);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
  }

  .mobile-menu-item.active {
    background: var(--button-hover);
    border-color: var(--accent-color);
    color: var(--accent-color);
    box-shadow: 0 2px 8px rgba(79, 195, 247, 0.2);
  }

  .mobile-menu-item.active:hover {
    background: var(--button-hover);
    transform: translateY(-1px);
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(79, 195, 247, 0.3);
  }
  
  /* --- Mobile Menu System --- */
  .mobile-menu {
    display: none;
    position: relative;
    z-index: 310;
  }
  
  .mobile-menu-panel {
    --mobile-panel-inset: 8px;
    position: fixed;
    top: 8px;
    left: var(--mobile-panel-inset);
    width: min(var(--menu-panel-width), calc(100vw - 16px));
    height: calc(100vh - 16px);
    background:
      linear-gradient(180deg, color-mix(in srgb, var(--bg-color) 94%, #10131a 6%), color-mix(in srgb, var(--bg-color) 98%, #000 2%));
    color: var(--text-color);
    border: 1px solid color-mix(in srgb, var(--border-color) 80%, rgba(255, 255, 255, 0.06));
    border-radius: 14px;
    box-shadow: none;
    transform: translateX(calc(-100% - var(--mobile-panel-inset) - 4px));
    transition: transform 1.3s var(--menu-ease);
    overflow-y: auto;
    padding: 0.8rem 0.8rem 1rem;
    display: flex;
    flex-direction: column;
    z-index: 300;
    will-change: transform;
  }
  
  .mobile-menu-panel.open {
    transform: translateX(0);
    box-shadow:
      0 22px 60px rgba(0, 0, 0, 0.5),
      inset 0 0 0 1px rgba(255, 255, 255, 0.04);
  }
  
  .mobile-menu-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(0, 0, 0, 0.55);
    -webkit-backdrop-filter: blur(3px);
    backdrop-filter: blur(3px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 1.1s var(--menu-ease);
    will-change: opacity;
  }
  
  .mobile-menu-overlay.open {
    opacity: 1;
    pointer-events: all;
  }
  
  .mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    margin-bottom: 0.7rem;
    padding: 0.35rem 0.25rem 0.65rem;
    gap: 0.5rem;
  }
  
  .mobile-menu-items {
    display: flex;
    flex-direction: column;
    gap: 0.56rem;
    flex: 0 0 auto;
    list-style: none;
    padding: 0.35rem 0 1rem;
    margin: 0;
  }

  .mobile-menu-items > li {
    position: relative;
    width: 100%;
  }

  .mobile-menu-items > li.mobile-export-item {
    z-index: 2200;
  }

  .mobile-menu-footer {
    position: relative;
    left: auto;
    bottom: auto;
    width: min(var(--mobile-menu-content-width), 100%);
    border-top: 1px solid color-mix(in srgb, var(--border-color) 88%, transparent);
    padding: 0.9rem 0.15rem 0.2rem;
    text-align: center;
    font-size: 0.95rem;
    color: color-mix(in srgb, var(--text-color) 78%, transparent);
    font-weight: 500;
    background: transparent;
    margin-top: 0.5rem;
  }

  /* Keep content column narrower than panel on wider devices */
  .mobile-stats-line,
  .mobile-menu-items,
  .mobile-menu-footer {
    width: min(var(--mobile-menu-content-width), 100%);
    margin-right: auto;
  }

  .menu-links li {
    opacity: 0;
    transform: translateX(-16px);
    transition: opacity 0.9s var(--menu-ease), transform 0.9s var(--menu-ease);
    transition-delay: var(--delay, 0ms);
  }

  .mobile-menu-panel.open .menu-links li {
    opacity: 1;
    transform: translateX(0);
  }

  .menu-links .dropdown {
    width: 100%;
  }

  /* Keep export menu floating and anchored to the export row */
  .mobile-menu-panel .dropdown {
    position: relative;
    z-index: 5;
  }

  .mobile-menu-panel .dropdown.show {
    z-index: 1400;
  }

  .mobile-menu-panel .dropdown-menu {
    position: absolute !important;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    inset: auto 0 auto 0 !important;
    transform: none !important;
    width: 100% !important;
    min-width: 100% !important;
    max-height: min(50vh, 340px);
    overflow-y: auto;
    margin-top: 0.45rem !important;
    margin-bottom: 0 !important;
    float: none !important;
    z-index: 1401 !important;
  }

  .mobile-menu-panel .dropdown-menu.modern-dropdown {
    background: color-mix(in srgb, var(--bg-color) 94%, #000 6%) !important;
    border: 1px solid color-mix(in srgb, var(--accent-color) 28%, var(--border-color)) !important;
    box-shadow: 0 14px 36px rgba(0, 0, 0, 0.48) !important;
  }

  .mobile-menu-panel .dropdown-menu:not(.show) {
    display: none;
  }

  .hamburger .hamburger-inner,
  .hamburger .hamburger-inner::before,
  .hamburger .hamburger-inner::after {
    background-color: currentColor;
  }
  
  /* =================================================================
     7. DROPDOWN COMPONENTS
     ================================================================= */
  
  .modern-dropdown {
    position: relative;
    background: linear-gradient(180deg, rgba(255,255,255,0.12), rgba(255,255,255,0.06)) !important;
    border: 1px solid rgba(79, 195, 247, 0.25) !important;
    border-radius: 12px !important;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35) !important;
    padding: 0.5rem !important;
    margin-top: 0.5rem !important;
    -webkit-backdrop-filter: blur(22px) saturate(200%);
    backdrop-filter: blur(22px) saturate(200%);
    min-width: 230px;
  }

  .modern-dropdown::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 12px;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.08);
    pointer-events: none;
  }
  
  .modern-dropdown .dropdown-item {
    display: flex !important;
    align-items: center !important;
    gap: 0.75rem !important;
    padding: 0.7rem 0.95rem !important;
    border-radius: 8px !important;
    margin: 2px 0 !important;
    color: var(--text-color) !important;
    font-weight: 500 !important;
    transition: transform 0.15s ease, background 0.15s ease !important;
  }
  
  .modern-dropdown .dropdown-item:hover {
    background: rgba(79, 195, 247, 0.12) !important;
    transform: translateX(3px) !important;
  }

  .modern-dropdown .dropdown-item i {
    opacity: 0.9 !important;
  }

  .modern-dropdown .dropdown-item:not(:first-child) {
    border-top: 1px solid rgba(255,255,255,0.06);
  }
  
  .dropdown-menu {
    background-color: var(--bg-color);
    border-color: var(--border-color);
  }
  
  .dropdown-item {
    color: var(--text-color);
  }
  
  .dropdown-item:hover, .dropdown-item:focus {
    background-color: var(--button-hover);
    color: var(--text-color);
  }
  
  /* =================================================================
     8. EDITOR & PREVIEW PANES
     ================================================================= */
  
  .editor-pane {
    flex: 1;
    padding: 10px 0px 10px 10px;
    overflow: hidden;
    position: relative;
    transition: all 0.3s ease;
    background-color: var(--editor-bg);
    border-right: 1px solid rgba(79, 195, 247, 0.12);
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 100%;
  }

  /* In editor-only, pane should not scroll; page owns the scrollbar */
  body.editor-only-active .editor-pane {
    overflow: visible;
  }

  /* Drag-and-drop highlight for editor pane */
  .editor-pane.drop-active::after {
    content: "📥  Drop your file to load";
    position: absolute;
    inset: 8px;
    border: 2px dashed rgba(79, 195, 247, 0.6);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
    font-family: "JetBrains Mono", "Fira Code", Consolas, monospace;
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 0.1px;
    text-shadow: 0 1px 3px rgba(0,0,0,0.35);
    background: linear-gradient(180deg, rgba(79,195,247,0.045), rgba(79,195,247,0.02));
    -webkit-backdrop-filter: blur(2px) saturate(140%);
    backdrop-filter: blur(2px) saturate(140%);
    box-shadow: inset 0 0 0 2px rgba(79,195,247,0.22), 0 8px 24px rgba(0,0,0,0.22);
    pointer-events: none;
    z-index: 9;
    transition: all 120ms ease;
  }
  
  .preview-pane {
    flex: 1;
    padding: 20px;
    overflow-y: auto; /* split view default */
    overflow-x: hidden;
    position: relative;
    transition: all 0.3s ease;
    background-color: var(--preview-bg);
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.05);
    width: 100%;
    max-width: 100%;
  }

  /* In preview-only, native page scroll should take over (no inner scroll) */
  body.preview-only-active .preview-pane {
    overflow: visible;
  }

  /* Safety: disable any scoped webkit scrollbar skin when NOT in split */
  body.editor-only-active .editor-pane::-webkit-scrollbar,
  body.editor-only-active .editor-pane::-webkit-scrollbar-track,
  body.editor-only-active .editor-pane::-webkit-scrollbar-thumb,
  body.editor-only-active #markdown-editor::-webkit-scrollbar,
  body.editor-only-active #markdown-editor::-webkit-scrollbar-track,
  body.editor-only-active #markdown-editor::-webkit-scrollbar-thumb,
  body.preview-only-active .preview-pane::-webkit-scrollbar,
  body.preview-only-active .preview-pane::-webkit-scrollbar-track,
  body.preview-only-active .preview-pane::-webkit-scrollbar-thumb {
    width: auto !important;
    height: auto !important;
    background: initial !important;
    border: initial !important;
    box-shadow: none !important;
  }
  
  .editor-wrapper {
    position: relative;
    width: 100%;
    height: calc(100% - 44px);
    margin-top: 0;
  }

  /* Fix: Reset wrapper height in editor-only mode */
  body.editor-only-active .editor-wrapper {
    height: auto;
    min-height: 0;
  }
  
  /* =================================================================
     9. MARKDOWN EDITOR
     ================================================================= */
  
  #markdown-editor {
    width: 100%;
    height: 100%;
    border: none;
    background-color: var(--editor-bg);
    color: var(--text-color);
    resize: none;
    font-family: "JetBrains Mono", "Fira Code", "Consolas", "Monaco", "Lucida Console", monospace;
    font-size: 16px;
    line-height: 1.5;
    padding: 10px 10px 50px 10px;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-y: auto; /* default in split view */
    font-feature-settings: "liga" 1, "calt" 1;
  }
  
  #markdown-editor:focus {
    outline: none;
  }

  /* Monaco host should own editor chrome while preserving existing panel colors */
  #markdown-editor.monaco-host {
    padding: 0;
    overflow: hidden;
    font-feature-settings: normal;
    font-variant-ligatures: none;
  }

  /* Disable transitions while recalculating Monaco layout to prevent flash artifacts */
  body.layout-recalc .content-container,
  body.layout-recalc .editor-pane,
  body.layout-recalc .editor-wrapper,
  body.layout-recalc #markdown-editor,
  body.layout-recalc #markdown-editor .monaco-editor {
    transition: none !important;
  }

  #markdown-editor.monaco-host .monaco-editor,
  #markdown-editor.monaco-host .monaco-editor .margin,
  #markdown-editor.monaco-host .monaco-editor .monaco-editor-background {
    background-color: var(--editor-bg) !important;
  }

  /* Keep Monaco text selection blue for stable visual consistency. */
  #markdown-editor.monaco-host .monaco-editor .focused .selected-text,
  #markdown-editor.monaco-host .monaco-editor .selected-text {
    background-color: rgba(79, 195, 247, 0.28) !important;
  }

  /* Hide Monaco suggest widgets for markdown-first UX. */
  #markdown-editor.monaco-host .suggest-widget,
  #markdown-editor.monaco-host .parameter-hints-widget {
    display: none !important;
  }

  /* Keep Monaco scrollbar blue like the rest of split-view chrome. */
  #markdown-editor.monaco-host .monaco-scrollable-element > .scrollbar > .slider {
    background: rgba(79, 195, 247, 0.35) !important;
    border: 1px solid rgba(79, 195, 247, 0.18) !important;
    border-radius: 4px !important;
  }

  #markdown-editor.monaco-host .monaco-scrollable-element > .scrollbar > .slider:hover {
    background: rgba(79, 195, 247, 0.55) !important;
  }

  #markdown-editor.monaco-host .monaco-scrollable-element > .scrollbar > .slider.active {
    background: rgba(79, 195, 247, 0.7) !important;
  }

  /* Monaco scrollbar sits on the right edge; move stats bubble inward to avoid overlap */
  #markdown-editor.monaco-host ~ .editor-stats {
    right: 30px;
  }

  /* Editor-only textarea: no fixed height; page owns scroll */
  body.editor-only-active #markdown-editor {
    min-height: calc(100vh - 120px) !important;
    resize: none !important;
    overflow: hidden !important;
    /* Prevent browser scroll anchoring jitter while the textarea grows */
    overflow-anchor: none;
    /* Keep scrollbar space stable to avoid layout shifts */
    scrollbar-gutter: stable;
  }

  /* Monaco editor-only must not inherit textarea growth sizing rules */
  body.editor-only-active #markdown-editor.monaco-host {
    min-height: 0 !important;
    height: 100% !important;
    overflow: hidden !important;
    scrollbar-gutter: auto !important;
  }
  
  /* Editor-only mode: Make textarea expand to fit content */
  /* In editor-only, the pane is the scroller, textarea expands and doesn't scroll */
  .editor-pane.native-scrollbars #markdown-editor {
    height: auto;
    min-height: 100%;
    overflow: visible;
  }
  
  /* =================================================================
     10. EDITOR STATISTICS
     ================================================================= */
  
  .editor-stats {
    position: absolute;
    bottom: 10px;
    right: 15px;
    display: flex;
    gap: 0.75rem;
    padding: 0.5rem 0.75rem;
    background: var(--button-hover);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    font-size: 0.75rem;
    color: var(--text-color);
    z-index: 5;
    transition: all 0.2s ease;
  }

  /* Keep stats bubble always visible in editor-only mode (mobile/desktop) */
  body.editor-only-active .editor-stats {
    position: fixed;
    right: 12px;
    bottom: calc(12px + env(safe-area-inset-bottom));
    z-index: 1000;
    pointer-events: none; /* purely informational */
  }

  body.editor-only-active #markdown-editor.monaco-host ~ .editor-stats {
    right: calc(24px + env(safe-area-inset-right));
  }
  
  .editor-stat-item {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-weight: 500;
  }
  
  .editor-stat-item i {
    font-size: 0.7rem;
    opacity: 0.8;
  }
  
  .editor-stat-value {
    color: var(--accent-color);
    font-weight: 600;
  }
  
  /* =================================================================
     11. TOOLBAR COMPONENTS
     ================================================================= */
  
  /* --- Formatting Toolbar --- */
  .formatting-toolbar {
    display: flex;
    align-items: center;
    gap: 3px;
    padding: 7px 10px 10px 10px;
    justify-content: center;
    background: rgba(var(--editor-bg-rgb, 255, 255, 255), 0.8);
    border-bottom: 1px solid rgba(79, 195, 247, 0.2);
    flex-wrap: nowrap;
    position: sticky;
    top: 0;
    z-index: 10;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    backdrop-filter: blur(20px) saturate(180%);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
    animation: toolbarGlow 3s ease-in-out infinite alternate;
    width: calc(100% - 16px);
    margin-left: 4px;
    margin-right: 12px;
  }
  
  .format-button {
    background: rgba(var(--button-bg-rgb, 248, 249, 250), 0.7);
    border: 1px solid rgba(79, 195, 247, 0.2);
    color: var(--text-color);
    border-radius: 6px;
    padding: 6px 8px;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    height: 28px;
    transition: all 0.3s ease;
    -webkit-user-select: none;
    user-select: none;
    -webkit-backdrop-filter: blur(12px) saturate(150%);
    backdrop-filter: blur(12px) saturate(150%);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  }
  
  .format-button:hover {
    background: rgba(79, 195, 247, 0.15);
    border-color: rgba(79, 195, 247, 0.6);
    color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 195, 247, 0.3);
    -webkit-backdrop-filter: blur(16px) saturate(200%);
    backdrop-filter: blur(16px) saturate(200%);
  }
  
  .format-button:active {
    background-color: rgba(79, 195, 247, 0.15);
    transform: scale(0.95);
  }
  
  .format-button i {
    font-size: 14px;
  }
  
  #format-h1, #format-h2, #format-h3 {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    min-width: 32px;
    font-weight: 600;
  }
  
  .toolbar-separator {
    width: 2px;
    height: 20px;
    background-color: rgba(255, 255, 255, 0.3);
    margin: 0 6px;
    border-radius: 1px;
    opacity: 0.8;
  }
  
  /* =================================================================
     12. FILE HANDLING & DRAG-DROP
     ================================================================= */
  
  .file-input {
    display: none;
  }
  
  .dropzone {
    border: 2px dashed rgba(79, 195, 247, 0.4);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    margin-bottom: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: rgba(79, 195, 247, 0.05);
    position: relative;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
  }
  
  .dropzone.active {
    border-color: rgba(79, 195, 247, 0.8);
    background-color: rgba(79, 195, 247, 0.1);
    transform: scale(1.02);
    box-shadow: 0 8px 25px rgba(79, 195, 247, 0.2);
  }
  
  .dropzone p {
    transition: transform 0.2s ease;
    color: var(--accent-color);
    font-weight: 500;
  }
  
  .dropzone:hover {
    border-color: rgba(79, 195, 247, 0.6);
    background-color: rgba(79, 195, 247, 0.08);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(79, 195, 247, 0.15);
  }
  
  .dropzone:hover p {
    transform: scale(1.02);
  }
  
  .close-btn {
    position: absolute;
    top: 0;
    right: 0;
    background-color: var(--button-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    padding: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    opacity: 0.8;
    transition: all 0.3s ease;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    margin: 8px;
    z-index: 10;
  }
  
  .close-btn:hover {
    opacity: 1;
    background-color: rgba(255, 107, 107, 0.1);
    border-color: var(--color-danger-fg);
    color: var(--color-danger-fg);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.2);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
  }
  

  
  /* =================================================================
     14. MARKDOWN PREVIEW CONTENT
     ================================================================= */
  
  .markdown-body {
    padding: 10px;
    width: 100%;
    background-color: var(--preview-bg);
    color: var(--preview-text-color);
    box-sizing: border-box;
    min-width: 200px;
    max-width: 800px;
    margin: 0 auto;
    padding: 45px;
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    font-size: 1.05rem;
    line-height: 1.7;
    overflow-x: hidden;
  }

  /* Normalize heading spacing across themes */
  .markdown-body h1,
  .markdown-body h2,
  .markdown-body h3,
  .markdown-body h4,
  .markdown-body h5,
  .markdown-body h6 {
    margin-top: 2rem;
    margin-bottom: 1rem;
  }

  /* Slightly larger, document-like scale when in preview-only mode */
  body.preview-only-active .markdown-body {
    max-width: 920px;
    font-size: 1.05rem;
    line-height: 1.7;
  }

  body.preview-only-active .markdown-body h1 { font-size: 2.1em; }
  body.preview-only-active .markdown-body h2 { font-size: 1.7em; }
  body.preview-only-active .markdown-body h3 { font-size: 1.4em; }
  
  .markdown-body img {
    background-color: transparent !important;
  }

  .markdown-body img[src*="img.shields.io"] {
    display: block;
    width: fit-content;
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    image-rendering: auto;
  }

  .markdown-body p:has(img[src*="img.shields.io"]) {
    margin: 12px 0;
    line-height: 0.75;
  }
  
  /* --- Lists --- */
  .markdown-body ul {
    list-style-type: disc;
    padding-left: 2.2em;
  }
  
  .markdown-body ol,
  .markdown-body ol ol {
    list-style: none !important;
    padding-left: 2.2em;
    margin-left: 0;
    counter-reset: item;
  }

  .markdown-body ol li {
    list-style: none !important;
  }

  .markdown-body ol li::marker {
    content: "" !important;
  }

  .markdown-body ol > li {
    counter-increment: item;
    position: relative;
  }

  .markdown-body ol > li::before {
    content: counters(item, ".") ". ";
    position: absolute;
    left: -2.2em;
    width: 2.2em;
    padding-right: 0.2em;
    box-sizing: border-box;
    text-align: right;
    font-weight: 600;
    color: currentColor;
  }
  
  .markdown-body li {
    margin-bottom: 0.25em;
  }
  
  .markdown-body li > p {
    margin-top: 0.5em;
    margin-bottom: 0.5em;
  }
  
  /* --- Block Elements --- */
  .markdown-body blockquote {
    color: var(--blockquote-color, #cccccc);
    border-left: 4px solid var(--accent-color);
    padding-left: 1em;
    margin: 1em 0;
  }
  
  .markdown-body hr {
    background-color: var(--markdown-hr-color, color-mix(in srgb, var(--preview-text-color) 38%, transparent));
    border: none;
    height: 2px;
    margin: 30px 0;
    opacity: 1;
  }

  .markdown-body mark {
    background-color: #fff3a3;
    color: #24292e;
    padding: 0.08em 0.18em;
    border-radius: 3px;
  }

  .markdown-body abbr[title] {
    text-decoration: underline dotted currentColor;
    text-underline-offset: 0.18em;
    cursor: help;
  }
  
  .markdown-body h1,
  .markdown-body h2,
  .markdown-body h3,
  .markdown-body h4,
  .markdown-body h5,
  .markdown-body h6 {
    font-weight: 900;
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  }

  .markdown-body h1,
  .markdown-body h2 {
    padding-bottom: 0.3em;
    border-bottom: 1px solid color-mix(in srgb, var(--preview-text-color) 24%, transparent);
  }
  
  /* --- Enhanced Code Blocks --- */
  .enhanced-code-block {
    background-color: var(--code-pre-bg, #f6f8fa);
    border-radius: 12px;
    margin: 1.5em 0;
    overflow: hidden;
    border: 1px solid var(--border-color, #e1e4e8);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: all 0.2s ease;
  }

  .enhanced-code-block:hover {
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
    transform: translateY(-1px);
  }

  .code-block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 16px;
    background: var(--code-header-bg, rgba(0, 0, 0, 0.05));
    border-bottom: 1px solid var(--code-header-border, rgba(0, 0, 0, 0.1));
    font-size: 13px;
    font-weight: 500;
  }

  .code-language {
    color: var(--text-color, #24292e);
    font-family: "Fira Code", "JetBrains Mono", "Consolas", "Monaco", "Lucida Console", monospace;
    text-transform: lowercase;
    opacity: 0.8;
    font-weight: 600;
    letter-spacing: 0.5px;
  }

  .code-block-header-actions {
    display: flex;
    align-items: center;
    gap: 2px;
  }

  /* Preview code header: Grok-style hover/focus hints (fine pointer only; touch has no hover) */
  #markdown-preview .code-block-header-actions [data-marktide-tip] {
    position: relative;
  }

  #markdown-preview .code-block-header-actions [data-marktide-tip]::after {
    content: attr(data-marktide-tip);
    position: absolute;
    top: calc(100% + 6px);
    left: 50%;
    z-index: 60;
    padding: 0.32rem 0.55rem;
    border-radius: 6px;
    font-size: 0.72rem;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: 0.01em;
    white-space: nowrap;
    color: #f3f4f8;
    background: rgba(22, 24, 30, 0.96);
    border: 1px solid color-mix(in srgb, var(--border-color) 45%, transparent);
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.38);
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(-3px);
    transition:
      opacity 0.12s ease,
      transform 0.12s ease,
      visibility 0.12s ease;
  }

  #markdown-preview .code-block-header-actions [data-marktide-tip]:focus-visible::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
  }

  /* Preview-only wrap control (long lines): Grok-style icons, shown only when overflow or while wrapped */
  #markdown-preview .wrap-code-btn {
    display: none;
    background: transparent;
    border: none;
    border-radius: 50%;
    color: var(--text-color, #24292e);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    align-items: center;
    justify-content: center;
    opacity: 0.6;
    transition: opacity 0.15s ease, transform 0.1s ease;
  }

  #markdown-preview .wrap-code-btn.wrap-code-btn--show {
    display: flex;
  }

  #markdown-preview .wrap-code-btn:hover {
    opacity: 1;
  }

  #markdown-preview .wrap-code-btn:active {
    transform: scale(0.92);
  }

  #markdown-preview .wrap-code-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 0;
  }

  #markdown-preview .wrap-code-svg {
    width: 16px;
    height: 16px;
    display: block;
  }

  #markdown-preview .enhanced-code-block:not(.is-wrapped) .wrap-code-icon--unwrap {
    display: none !important;
  }

  #markdown-preview .enhanced-code-block.is-wrapped .wrap-code-icon--wrap {
    display: none !important;
  }

  #markdown-preview .enhanced-code-block.is-wrapped > pre {
    overflow-x: hidden;
    white-space: pre-wrap;
    word-break: break-word;
    overflow-wrap: anywhere;
  }

  #markdown-preview .enhanced-code-block.is-wrapped > pre code.hljs {
    white-space: pre-wrap !important;
    word-break: break-word;
    overflow-wrap: anywhere;
  }

  .enhanced-code-block .copy-code-btn {
    background: transparent;
    border: none;
    border-radius: 50%; /* Circular shape */
    color: var(--text-color, #24292e);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    font-size: 16px;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.6;
  }

  .enhanced-code-block .copy-code-btn:hover {
    opacity: 1;
  }

  .enhanced-code-block .copy-code-btn:active {
    transform: scale(0.9);
    transition: transform 0.1s ease;
  }

  .enhanced-code-block .copy-code-btn.copied {
    opacity: 1;
  }

  .enhanced-code-block .copy-code-btn.error {
    background: rgba(244, 67, 54, 0.15);
    color: #f44336;
  }

  .enhanced-code-block pre {
    background: transparent;
    border-radius: 0;
    padding: 16px;
    margin: 0;
    overflow: auto;
    font-size: 85%;
    line-height: 1.45;
    font-family: "Fira Code", "JetBrains Mono", "Consolas", "Monaco", "Lucida Console", monospace;
    font-feature-settings: "liga" 1, "calt" 1;
  }
  
  .enhanced-code-block pre code,
  .enhanced-code-block pre code.hljs {
    background: transparent;
    padding: 0;
    border-radius: 0;
    font-family: "Fira Code", "JetBrains Mono", "Consolas", "Monaco", "Lucida Console", monospace;
    font-feature-settings: "liga" 1, "calt" 1;
  }

  /* Legacy code blocks (fallback) */
  .markdown-body pre:not(.enhanced-code-block pre) {
    background-color: var(--code-pre-bg, #f6f8fa);
    border-radius: 6px;
    padding: 16px;
    margin: 1.5em 0;
    overflow: auto;
    font-size: 85%;
    line-height: 1.45;
    font-family: "Fira Code", "JetBrains Mono", "Consolas", "Monaco", "Lucida Console", monospace;
    font-feature-settings: "liga" 1, "calt" 1;
  }
  
  .markdown-body pre:not(.enhanced-code-block pre) code,
  .markdown-body pre:not(.enhanced-code-block pre) code.hljs {
    background: transparent;
    padding: 0;
    border-radius: 0;
    font-family: "Fira Code", "JetBrains Mono", "Consolas", "Monaco", "Lucida Console", monospace;
    font-feature-settings: "liga" 1, "calt" 1;
  }
  
  .markdown-body code {
    background-color: var(--code-inline-bg, #f6f8fa);
    color: var(--code-inline-color, #24292e);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-size: 85%;
    font-family: "Fira Code", "JetBrains Mono", "Consolas", "Monaco", "Lucida Console", monospace;
    font-feature-settings: "liga" 1, "calt" 1;
  }

  /* hljs themes (CDN) use `pre code.hljs { overflow-x: auto }`, which attaches the scrollbar to
     <code> (see DevTools). Turn that off so <pre> is the scroll container and slim ::-webkit
     rules below actually apply. */
  #markdown-preview pre code.hljs {
    display: block;
    overflow-x: visible !important;
    overflow-y: visible !important;
  }

  /* Code fences and Mermaid diagrams: slim scrollbars hidden until hover */
  #markdown-preview pre,
  #markdown-preview .mermaid-container,
  #markdown-preview .mermaid {
    scrollbar-width: thin;
    scrollbar-color: transparent transparent;
    scrollbar-gutter: stable;
    transition: scrollbar-color 0.2s ease;
  }

  #markdown-preview pre:hover,
  #markdown-preview .mermaid-container:hover,
  #markdown-preview .mermaid:hover {
    scrollbar-color: rgba(79, 195, 247, 0.55) transparent;
  }

  #markdown-preview pre::-webkit-scrollbar,
  #markdown-preview .mermaid-container::-webkit-scrollbar,
  #markdown-preview .mermaid::-webkit-scrollbar {
    width: 4px;
    height: 4px;
    background: transparent;
  }

  #markdown-preview pre::-webkit-scrollbar-button,
  #markdown-preview .mermaid-container::-webkit-scrollbar-button,
  #markdown-preview .mermaid::-webkit-scrollbar-button {
    display: none;
    width: 0;
    height: 0;
  }

  #markdown-preview pre::-webkit-scrollbar-track,
  #markdown-preview .mermaid-container::-webkit-scrollbar-track,
  #markdown-preview .mermaid::-webkit-scrollbar-track {
    background: transparent;
    border: 0;
  }

  #markdown-preview pre::-webkit-scrollbar-thumb,
  #markdown-preview .mermaid-container::-webkit-scrollbar-thumb,
  #markdown-preview .mermaid::-webkit-scrollbar-thumb {
    background: transparent;
    border: 0;
    border-radius: 999px;
    transition: background-color 0.2s ease;
  }

  #markdown-preview pre:hover::-webkit-scrollbar-thumb,
  #markdown-preview .mermaid-container:hover::-webkit-scrollbar-thumb,
  #markdown-preview .mermaid:hover::-webkit-scrollbar-thumb {
    background: rgba(79, 195, 247, 0.55);
  }

  #markdown-preview pre:hover::-webkit-scrollbar-thumb:hover,
  #markdown-preview .mermaid-container:hover::-webkit-scrollbar-thumb:hover,
  #markdown-preview .mermaid:hover::-webkit-scrollbar-thumb:hover {
    background: rgba(79, 195, 247, 0.8);
  }

  #markdown-preview pre::-webkit-scrollbar-corner,
  #markdown-preview .mermaid-container::-webkit-scrollbar-corner,
  #markdown-preview .mermaid::-webkit-scrollbar-corner {
    background: transparent;
  }

  
  /* =================================================================
     15. MERMAID DIAGRAMS
     ================================================================= */
  
  .mermaid-container {
    position: relative;
  }

  .mermaid-container, .mermaid {
    text-align: center;
    margin: 1em 0;
    overflow-x: auto;
    overflow-y: visible;
    max-width: 100%;
  }

  #markdown-preview .mermaid-container {
    background: #ffffff;
    border: 1px solid transparent;
    border-radius: 6px;
    padding: 16px;
  }

  .mermaid svg {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 0 auto;
    overflow: visible;
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  }

  .mermaid .node rect,
  .mermaid .node circle,
  .mermaid .node ellipse,
  .mermaid .node polygon {
    stroke-width: 1px;
  }

  .mermaid .nodeLabel,
  .mermaid .edgeLabel,
  .mermaid .label,
  .mermaid text {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif !important;
  }

  /* =================================================================
     16. FOOTER
     ================================================================= */
  
  .app-footer {
    background: linear-gradient(135deg, var(--header-bg) 0%, var(--header-gradient) 100%);
    border-top: 1px solid var(--border-color);
    padding: 16px 0;
    transition: background 0.3s ease;
    flex-shrink: 0;
  }
  
  .footer-text {
    margin: 0;
    font-size: 14px;
    color: var(--text-color);
    opacity: 0.8;
    transition: color 0.3s ease, opacity 0.3s ease;
    font-weight: 500;
  }
  
  .footer-text:hover {
    opacity: 1;
  }
  
  /* Footer heart with strawberry border effect */
  .footer-heart {
    color: transparent;
    font-size: 12px;
    animation: heartbeat 2s ease-in-out infinite;
    transition: all 0.3s ease;
    -webkit-text-stroke: 0.8px var(--heart-color-light, #ff6b7a);
    filter: drop-shadow(0 0 1px rgba(255, 107, 122, 0.8));
  }
  
  .footer-heart:hover {
    -webkit-text-stroke: 1px var(--heart-color-dark, #ff4757);
    transform: scale(1.05);
    filter: drop-shadow(0 0 2px rgba(255, 71, 87, 0.9));
  }
  
  /* =================================================================
     17. SCROLLBAR CUSTOMIZATION
     ================================================================= */
  
  /* --- Main Scrollbars (Split View Only) ---
     NOTE: Blue custom scrollbars are intentionally restricted to SPLIT VIEW.
     In editor-only and preview-only modes, the browser native scrollbars must be used.
     We scope these rules to body:not(.editor-only-active):not(.preview-only-active) to ensure this. */
  body:not(.editor-only-active):not(.preview-only-active) .editor-pane::-webkit-scrollbar,
  body:not(.editor-only-active):not(.preview-only-active) .preview-pane::-webkit-scrollbar,
  body:not(.editor-only-active):not(.preview-only-active) #markdown-editor::-webkit-scrollbar {
    width: 8px;
    height: 8px;
  }
  
  /* Editor-side baseline scrollbar (faint) */
  body:not(.editor-only-active):not(.preview-only-active) .editor-pane::-webkit-scrollbar-track,
  body:not(.editor-only-active):not(.preview-only-active) #markdown-editor::-webkit-scrollbar-track {
    background: rgba(79, 195, 247, 0.06);
    border-radius: 5px;
  }
  
  body:not(.editor-only-active):not(.preview-only-active) .editor-pane::-webkit-scrollbar-thumb,
  body:not(.editor-only-active):not(.preview-only-active) #markdown-editor::-webkit-scrollbar-thumb {
    background: rgba(79, 195, 247, 0.22);
    border-radius: 5px;
    border: 1px solid rgba(79, 195, 247, 0.12);
    box-shadow: 0 0 0 rgba(79, 195, 247, 0);
  }

  /* Preview-side scrollbar: hidden by default, reveal on preview hover (Monaco-like) */
  body:not(.editor-only-active):not(.preview-only-active) .preview-pane::-webkit-scrollbar-track {
    background: transparent;
    border-radius: 5px;
  }

  body:not(.editor-only-active):not(.preview-only-active) .preview-pane::-webkit-scrollbar-thumb {
    background: transparent;
    border-radius: 5px;
    border: 1px solid transparent;
    box-shadow: none;
  }

  body:not(.editor-only-active):not(.preview-only-active).preview-scrollbar-hover .preview-pane::-webkit-scrollbar-track {
    background: rgba(79, 195, 247, 0.1);
  }

  body:not(.editor-only-active):not(.preview-only-active).preview-scrollbar-hover .preview-pane::-webkit-scrollbar-thumb {
    background: rgba(79, 195, 247, 0.3);
    border: 1px solid rgba(79, 195, 247, 0.2);
  }

  body:not(.editor-only-active):not(.preview-only-active).preview-scrollbar-hover .preview-pane::-webkit-scrollbar-thumb:hover {
    background: rgba(79, 195, 247, 0.5);
    box-shadow: 0 0 10px rgba(79, 195, 247, 0.3);
  }

  /* Firefox preview scrollbar parity: thin+transparent by default, blue on hover */
  body:not(.editor-only-active):not(.preview-only-active) .preview-pane {
    scrollbar-gutter: stable;
    scrollbar-width: thin;
    scrollbar-color: transparent transparent;
  }

  body:not(.editor-only-active):not(.preview-only-active).preview-scrollbar-hover .preview-pane {
    scrollbar-width: thin;
    scrollbar-color: rgba(79, 195, 247, 0.45) rgba(79, 195, 247, 0.10);
  }

  /* Make editor-side split-view scrollbar stronger while hovering editor pane */
  body:not(.editor-only-active):not(.preview-only-active) .editor-pane:hover::-webkit-scrollbar-track,
  body:not(.editor-only-active):not(.preview-only-active) .editor-pane:hover #markdown-editor::-webkit-scrollbar-track,
  body:not(.editor-only-active):not(.preview-only-active) #markdown-editor:hover::-webkit-scrollbar-track {
    background: rgba(79, 195, 247, 0.1);
  }

  body:not(.editor-only-active):not(.preview-only-active) .editor-pane:hover::-webkit-scrollbar-thumb,
  body:not(.editor-only-active):not(.preview-only-active) .editor-pane:hover #markdown-editor::-webkit-scrollbar-thumb,
  body:not(.editor-only-active):not(.preview-only-active) #markdown-editor:hover::-webkit-scrollbar-thumb {
    background: rgba(79, 195, 247, 0.3);
    border: 1px solid rgba(79, 195, 247, 0.2);
  }

  body:not(.editor-only-active):not(.preview-only-active) .editor-pane:hover::-webkit-scrollbar-thumb:hover,
  body:not(.editor-only-active):not(.preview-only-active) .editor-pane:hover #markdown-editor::-webkit-scrollbar-thumb:hover,
  body:not(.editor-only-active):not(.preview-only-active) #markdown-editor:hover::-webkit-scrollbar-thumb:hover {
    background: rgba(79, 195, 247, 0.5);
    box-shadow: 0 0 10px rgba(79, 195, 247, 0.3);
  }
  
  /* --- Toolbar Scrollbars --- */
  .formatting-toolbar::-webkit-scrollbar {
    height: 2px;
  }
  
  .formatting-toolbar::-webkit-scrollbar-track {
    background: transparent;
  }
  
  .formatting-toolbar::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 2px;
  }
  
  .formatting-toolbar::-webkit-scrollbar-thumb:hover {
    background: var(--button-active);
  }
  
  /* =================================================================
     18. UTILITY CLASSES & ACCESSIBILITY
     ================================================================= */
  
  button:focus,
  a:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
  }

  /* Border utility class used by JavaScript */
  .border-primary {
    border-color: var(--accent-color) !important;
  }

  /* Radial theme reveal powered by View Transitions API */
  html.radial-theme-transition::view-transition-old(root),
  html.radial-theme-transition::view-transition-new(root) {
    animation: none;
    mix-blend-mode: normal;
  }

  html.radial-theme-transition::view-transition-old(root) {
    z-index: 0;
  }

  html.radial-theme-transition::view-transition-new(root) {
    z-index: 1;
  }

  /* Fallback ripple for browsers without View Transitions support */
  .theme-ripple-fallback {
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    z-index: 2147483646;
    transform: scale(0);
    transform-origin: center;
    opacity: 0;
    box-shadow: 0 0 0 1px rgba(127, 127, 127, 0.18), 0 0 24px rgba(0, 0, 0, 0.10);
    will-change: transform, opacity;
  }

  /* =================================================================
     WHAT'S NEW MODAL
     ================================================================= */

  .whats-new-overlay {
    position: fixed;
    inset: 0;
    z-index: 2147483000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.25rem;
    background: rgba(8, 11, 18, 0.62);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.38s cubic-bezier(0.16, 1, 0.3, 1), backdrop-filter 0.38s cubic-bezier(0.16, 1, 0.3, 1);
    height: 100vh;
    height: 100dvh;
  }

  .whats-new-overlay.open {
    opacity: 1;
    pointer-events: auto;
  }

  .whats-new-overlay.closing {
    opacity: 0;
    -webkit-backdrop-filter: blur(0);
    backdrop-filter: blur(0);
    pointer-events: none;
    transition: opacity 0.42s cubic-bezier(0.55, 0, 0.35, 1), backdrop-filter 0.42s cubic-bezier(0.55, 0, 0.35, 1);
  }

  .whats-new-dialog {
    position: relative;
    width: 100%;
    max-width: 520px;
    max-height: calc(100vh - 2.5rem);
    max-height: calc(100dvh - 2.5rem);
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 1.75rem 1.75rem 1.5rem;
    background:
      radial-gradient(120% 80% at 0% 0%, color-mix(in srgb, var(--accent-color) 14%, transparent) 0%, transparent 55%),
      linear-gradient(180deg, color-mix(in srgb, var(--bg-color) 92%, #10131a 8%), color-mix(in srgb, var(--bg-color) 98%, #000 2%));
    color: var(--text-color);
    border: 1px solid color-mix(in srgb, var(--accent-color) 30%, var(--border-color));
    border-radius: 16px;
    box-shadow:
      0 24px 70px rgba(0, 0, 0, 0.55),
      0 0 0 1px rgba(255, 255, 255, 0.04) inset;
    transform: translateY(22px) scale(0.94);
    opacity: 0;
    filter: blur(6px);
    transition:
      transform 0.42s cubic-bezier(0.16, 1, 0.3, 1),
      opacity 0.38s cubic-bezier(0.16, 1, 0.3, 1),
      filter 0.42s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .whats-new-overlay.open .whats-new-dialog {
    transform: translateY(0) scale(1);
    opacity: 1;
    filter: blur(0);
    animation: whatsNewDialogIn 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
  }

  .whats-new-overlay.closing .whats-new-dialog {
    transform: translateY(-18px) scale(0.88) rotate(-0.6deg);
    opacity: 0;
    filter: blur(8px);
    transition:
      transform 0.46s cubic-bezier(0.6, -0.1, 0.75, 0.2),
      opacity 0.36s cubic-bezier(0.55, 0, 0.35, 1),
      filter 0.4s cubic-bezier(0.55, 0, 0.35, 1);
  }

  .whats-new-dialog:focus {
    outline: none;
  }

  /* --- Hero logo (dancing MarkTide mark) --- */
  .whats-new-hero {
    position: relative;
    width: 84px;
    height: 84px;
    margin: 0 auto 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .whats-new-hero-glow {
    position: absolute;
    inset: -18px;
    border-radius: 50%;
    background:
      radial-gradient(circle at 50% 50%, color-mix(in srgb, var(--accent-color) 55%, transparent) 0%, transparent 65%);
    filter: blur(14px);
    opacity: 0;
    transform: scale(0.4);
    pointer-events: none;
  }

  .whats-new-overlay.open .whats-new-hero-glow {
    animation: whatsNewGlow 2.6s cubic-bezier(0.16, 1, 0.3, 1) 0.1s infinite alternate;
  }

  .whats-new-hero-logo {
    position: relative;
    width: 76px;
    height: 76px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 22px;
    color: #ffffff;
    font-size: 2.1rem;
    background:
      radial-gradient(120% 120% at 20% 15%, color-mix(in srgb, #ffffff 35%, transparent) 0%, transparent 55%),
      linear-gradient(
        140deg,
        color-mix(in srgb, var(--accent-color) 90%, #ffffff 10%) 0%,
        color-mix(in srgb, var(--accent-color) 82%, #000000 18%) 100%
      );
    box-shadow:
      0 12px 32px color-mix(in srgb, var(--accent-color) 45%, transparent),
      inset 0 1px 0 rgba(255, 255, 255, 0.35),
      inset 0 -1px 0 rgba(0, 0, 0, 0.18);
    transform-origin: 50% 55%;
    transform: scale(0.2) rotate(-40deg);
    opacity: 0;
  }

  .whats-new-overlay.open .whats-new-hero-logo {
    animation:
      whatsNewHeroEntrance 0.95s cubic-bezier(0.16, 1, 0.3, 1) both,
      whatsNewHeroDance 5.2s cubic-bezier(0.45, 0, 0.55, 1) 0.95s infinite;
  }

  .whats-new-overlay.closing .whats-new-hero-logo {
    animation: whatsNewHeroBye 0.42s cubic-bezier(0.55, 0, 0.35, 1) forwards;
  }

  .whats-new-hero-logo i {
    display: inline-block;
    transform-origin: 50% 55%;
    filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.22));
  }

  .whats-new-overlay.open .whats-new-hero-logo i {
    animation: whatsNewHeroIconWiggle 3.4s cubic-bezier(0.45, 0, 0.55, 1) 1s infinite;
  }

  .whats-new-hero-sparkle {
    position: absolute;
    color: color-mix(in srgb, var(--accent-color) 55%, #ffffff 45%);
    font-size: 0.6rem;
    opacity: 0;
    pointer-events: none;
    filter: drop-shadow(0 0 6px color-mix(in srgb, var(--accent-color) 80%, transparent));
  }

  .whats-new-hero-sparkle--a { top: -6px;  right: -10px; font-size: 0.72rem; }
  .whats-new-hero-sparkle--b { bottom: -4px; left: -12px; font-size: 0.58rem; }
  .whats-new-hero-sparkle--c { top: 42%; right: -14px; font-size: 0.5rem; }

  .whats-new-overlay.open .whats-new-hero-sparkle--a {
    animation: whatsNewSparkle 2.8s ease-in-out 1.1s infinite;
  }
  .whats-new-overlay.open .whats-new-hero-sparkle--b {
    animation: whatsNewSparkle 3.2s ease-in-out 1.6s infinite;
  }
  .whats-new-overlay.open .whats-new-hero-sparkle--c {
    animation: whatsNewSparkle 2.4s ease-in-out 2s infinite;
  }

  .whats-new-close {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--button-bg) 82%, transparent);
    border: 1px solid color-mix(in srgb, var(--border-color) 85%, transparent);
    color: var(--text-color);
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
  }

  .whats-new-close:hover {
    background: var(--button-hover);
    border-color: color-mix(in srgb, var(--accent-color) 45%, var(--border-color));
    transform: translateY(-1px);
  }

  .whats-new-close:active {
    transform: scale(0.96);
  }

  .whats-new-header {
    padding: 0.4rem 0 0;
    margin-bottom: 1.25rem;
    text-align: center;
  }

  .whats-new-header .whats-new-badge {
    align-self: center;
  }

  .whats-new-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.25rem 0.65rem;
    border-radius: 999px;
    background: color-mix(in srgb, var(--accent-color) 15%, transparent);
    border: 1px solid color-mix(in srgb, var(--accent-color) 40%, var(--border-color));
    color: color-mix(in srgb, var(--accent-color) 90%, var(--text-color));
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-bottom: 0.85rem;
  }

  .whats-new-badge i {
    font-size: 0.78rem;
  }

  .whats-new-title {
    font-size: 1.4rem;
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.01em;
    margin: 0 0 0.45rem;
    color: var(--text-color);
  }

  .whats-new-subtitle {
    font-size: 0.95rem;
    line-height: 1.5;
    color: color-mix(in srgb, var(--text-color) 72%, transparent);
    margin: 0;
  }

  .whats-new-list {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
  }

  .whats-new-item {
    display: flex;
    gap: 0.85rem;
    align-items: flex-start;
    padding: 0.85rem 0.95rem;
    border-radius: 12px;
    background: color-mix(in srgb, var(--button-bg) 55%, transparent);
    border: 1px solid color-mix(in srgb, var(--border-color) 75%, transparent);
    transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
  }

  .whats-new-item:hover {
    transform: translateY(-1px);
    border-color: color-mix(in srgb, var(--accent-color) 35%, var(--border-color));
    background: color-mix(in srgb, var(--button-bg) 75%, transparent);
  }

  .whats-new-item-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: color-mix(in srgb, var(--accent-color) 18%, transparent);
    color: var(--accent-color);
    font-size: 1.05rem;
    border: 1px solid color-mix(in srgb, var(--accent-color) 30%, transparent);
  }

  .whats-new-item-body {
    min-width: 0;
  }

  .whats-new-item-title {
    font-size: 0.97rem;
    font-weight: 600;
    margin: 0 0 0.2rem;
    color: var(--text-color);
  }

  .whats-new-item-text {
    font-size: 0.88rem;
    line-height: 1.45;
    margin: 0;
    color: color-mix(in srgb, var(--text-color) 70%, transparent);
  }

  .whats-new-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    flex-wrap: wrap;
  }

  .whats-new-link {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.88rem;
    font-weight: 500;
    color: color-mix(in srgb, var(--text-color) 75%, transparent);
    text-decoration: none;
    padding: 0.5rem 0.15rem;
    transition: color 0.2s ease;
  }

  .whats-new-link:hover {
    color: var(--accent-color);
  }

  .whats-new-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1.1rem;
    border-radius: 10px;
    border: 1px solid color-mix(in srgb, var(--accent-color) 55%, transparent);
    background: linear-gradient(
      180deg,
      color-mix(in srgb, var(--accent-color) 92%, #ffffff 8%),
      color-mix(in srgb, var(--accent-color) 86%, #000000 14%)
    );
    color: #ffffff;
    font-weight: 600;
    font-size: 0.92rem;
    cursor: pointer;
    box-shadow:
      0 6px 18px color-mix(in srgb, var(--accent-color) 35%, transparent),
      inset 0 1px 0 rgba(255, 255, 255, 0.25);
    transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
  }

  .whats-new-primary:hover {
    transform: translateY(-1px);
    filter: brightness(1.05);
    box-shadow:
      0 10px 22px color-mix(in srgb, var(--accent-color) 45%, transparent),
      inset 0 1px 0 rgba(255, 255, 255, 0.3);
  }

  .whats-new-primary:active {
    transform: scale(0.98);
  }

  .whats-new-primary i {
    font-size: 0.92rem;
    transition: transform 0.2s ease;
  }

  .whats-new-primary:hover i {
    transform: translateX(2px);
  }