/* ============================================
       CSS VARIABLES - MATERIAL DESIGN 3
       HATSUNE MIKU THEME
       ============================================ */
    :root {
      /* Miku Colors */
      --miku-primary: #39C5BB;
      --miku-primary-dark: #2AA89F;
      --miku-secondary: #FF4081;
      --miku-secondary-light: #FF80AB;
      
      /* Light Theme */
      --bg-primary: #FFFFFF;
      --bg-secondary: #F5F5F5;
      --bg-tertiary: #EEEEEE;
      --text-primary: #1C1B1F;
      --text-secondary: #49454F;
      --text-tertiary: #79747E;
      --border-color: #E0E0E0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
      --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
      --shadow-lg: 0 10px 20px rgba(0,0,0,0.15);
      
      /* Spacing */
      --space-xs: 4px;
      --space-sm: 8px;
      --space-md: 16px;
      --space-lg: 24px;
      --space-xl: 32px;
      
      /* Transitions */
      --transition-fast: 0.15s ease;
      --transition-normal: 0.3s ease;
      
      /* Safe area */
      --safe-top: env(safe-area-inset-top, 0px);
      --safe-bottom: env(safe-area-inset-bottom, 0px);
    }
    
    /* Dark Theme */
    [data-theme="dark"] {
      --bg-primary: #121212;
      --bg-secondary: #1E1E1E;
      --bg-tertiary: #2D2D2D;
      --text-primary: #E6E1E5;
      --text-secondary: #CAC4D0;
      --text-tertiary: #938F99;
      --border-color: #424242;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
      --shadow-md: 0 4px 6px rgba(0,0,0,0.5);
      --shadow-lg: 0 10px 20px rgba(0,0,0,0.6);
    }
    
    /* ============================================
       RESET & BASE
       ============================================ */
    *, *::before, *::after {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
      -webkit-tap-highlight-color: transparent;
    }
    
    body {
      font-family: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
      background: var(--bg-primary);
      color: var(--text-primary);
      line-height: 1.6;
      min-height: 100vh;
      transition: background var(--transition-normal), color var(--transition-normal);
      padding-top: 60px;
    }
    
    /* Scrollbar */
    ::-webkit-scrollbar {
      width: 8px;
      height: 8px;
    }
    ::-webkit-scrollbar-track {
      background: var(--bg-secondary);
    }
    ::-webkit-scrollbar-thumb {
      background: var(--text-tertiary);
      border-radius: 4px;
    }
    ::-webkit-scrollbar-thumb:hover {
      background: var(--miku-primary);
    }
    
    /* ============================================
       NAVBAR - RESPONSIVE
       ============================================ */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: 60px;
      background: linear-gradient(135deg, var(--miku-primary) 0%, var(--miku-primary-dark) 100%);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 var(--space-md);
      z-index: 1000;
      box-shadow: var(--shadow-md);
    }
    
    .navbar-brand {
      display: flex;
      align-items: center;
      gap: var(--space-sm);
      color: white;
      text-decoration: none;
      font-weight: 700;
      font-size: 1.1rem;
      white-space: nowrap;
    }
    
    .navbar-brand .material-icons-round {
      font-size: 24px;
    }
    
    /* Desktop Menu - Horizontal Scroll */
    .navbar-menu {
      display: flex;
      align-items: center;
      gap: var(--space-xs);
      list-style: none;
      overflow-x: auto;
      scrollbar-width: none;
      -ms-overflow-style: none;
      flex: 1;
      margin-left: var(--space-lg);
      padding: var(--space-sm) 0;
    }
    
    .navbar-menu::-webkit-scrollbar {
      display: none;
    }
    
    .navbar-menu li {
      flex-shrink: 0;
    }
    
    .navbar-menu a {
      display: flex;
      align-items: center;
      gap: var(--space-xs);
      padding: 8px 14px;
      color: rgba(255,255,255,0.9);
      text-decoration: none;
      font-size: 0.85rem;
      font-weight: 500;
      border-radius: 20px;
      white-space: nowrap;
      transition: all var(--transition-fast);
    }
    
    .navbar-menu a:hover {
      background: rgba(255,255,255,0.15);
      color: white;
    }
    
    .navbar-menu a.active {
      background: rgba(255,255,255,0.25);
      color: white;
    }
    
    /* Mobile Menu Toggle */
    .menu-toggle {
      display: none;
      width: 40px;
      height: 40px;
      align-items: center;
      justify-content: center;
      background: rgba(255,255,255,0.1);
      border: none;
      border-radius: 8px;
      color: white;
      cursor: pointer;
      transition: all var(--transition-fast);
    }
    
    .menu-toggle:hover {
      background: rgba(255,255,255,0.2);
    }
    
    .menu-toggle .material-icons-round {
      font-size: 24px;
    }
    
    /* Theme Toggle */
    .theme-toggle {
      width: 40px;
      height: 40px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: rgba(255,255,255,0.1);
      border: none;
      border-radius: 8px;
      color: white;
      cursor: pointer;
      margin-left: var(--space-sm);
      transition: all var(--transition-fast);
    }
    
    .theme-toggle:hover {
      background: rgba(255,255,255,0.2);
    }
    
    /* Mobile Menu Overlay */
    .mobile-menu-overlay {
      position: fixed;
      top: 60px;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(0,0,0,0.5);
      backdrop-filter: blur(4px);
      opacity: 0;
      visibility: hidden;
      transition: all var(--transition-normal);
      z-index: 999;
    }
    
    .mobile-menu-overlay.active {
      opacity: 1;
      visibility: visible;
    }
    
    .mobile-menu {
      position: fixed;
      top: 60px;
	  bottom: 20%;
      right: -100%;
      width: 80%;
      max-width: 320px;
      height: calc(100vh - 60px);
      background: var(--bg-primary);
      overflow-y: auto;
      transition: right var(--transition-normal);
      z-index: 1001;
      box-shadow: var(--shadow-lg);
      padding-bottom: var(--safe-bottom);
    }
    
    .mobile-menu.active {
      right: 0;
    }
    
    .mobile-menu-header {
      padding: var(--space-lg);
      background: linear-gradient(135deg, var(--miku-primary) 0%, var(--miku-primary-dark) 100%);
      color: white;
    }
    
    .mobile-menu-header h3 {
      font-size: 1.2rem;
      margin-bottom: var(--space-xs);
    }
    
    .mobile-menu-header p {
      font-size: 0.85rem;
      opacity: 0.9;
    }
    
    .mobile-menu-list {
      list-style: none;
      padding: var(--space-sm) 0;
    }
    
    .mobile-menu-list li {
      border-bottom: 1px solid var(--border-color);
    }
    
    .mobile-menu-list a {
      display: flex;
      align-items: center;
      gap: var(--space-md);
      padding: var(--space-md) var(--space-lg);
      color: var(--text-primary);
      text-decoration: none;
      font-size: 0.95rem;
      transition: all var(--transition-fast);
    }
    
    .mobile-menu-list a:hover {
      background: var(--bg-secondary);
      color: var(--miku-primary);
    }
    
    .mobile-menu-list a .material-icons-round {
      color: var(--miku-primary);
      font-size: 20px;
    }
    
    .mobile-menu-list a.external .material-icons-round {
      color: var(--miku-secondary);
    }
    
    /* ============================================
       MAIN CONTENT
       ============================================ */
    .main-content {
      max-width: 800px;
      margin: 0 auto;
      padding: var(--space-lg) var(--space-md);
    }
    
    h1 {
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: var(--space-lg);
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: var(--space-sm);
    }
    
    h1 .material-icons-round {
      color: var(--miku-primary);
    }
    
    /* ============================================
       FORM COMPONENTS - MATERIAL DESIGN
       ============================================ */
    .form-group {
      margin-bottom: var(--space-lg);
      padding: var(--space-md);
      background: var(--bg-secondary);
      border-radius: 16px;
      border: 1px solid var(--border-color);
    }
    
    .form-group-title {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--miku-primary);
      margin-bottom: var(--space-md);
      display: flex;
      align-items: center;
      gap: var(--space-sm);
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    
    label {
      display: block;
      font-size: 0.875rem;
      font-weight: 500;
      color: var(--text-primary);
      margin-bottom: var(--space-xs);
      margin-top: var(--space-md);
    }
    
    label:first-of-type {
      margin-top: 0;
    }
    
    input[type="text"],
    select,
    textarea {
      width: 100%;
      padding: 12px 16px;
      font-size: 1rem;
      font-family: inherit;
      background: var(--bg-primary);
      border: 2px solid var(--border-color);
      border-radius: 12px;
      color: var(--text-primary);
      transition: all var(--transition-fast);
      outline: none;
    }
    
    input[type="text"]:focus,
    select:focus,
    textarea:focus {
      border-color: var(--miku-primary);
      box-shadow: 0 0 0 4px rgba(57, 197, 187, 0.15);
    }
    
    input[type="text"]::placeholder {
      color: var(--text-tertiary);
    }
    
    select {
      cursor: pointer;
      appearance: none;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='%2379747E'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
      background-repeat: no-repeat;
      background-position: right 12px center;
      padding-right: 40px;
    }
    
    select[multiple] {
      background-image: none;
      padding-right: 16px;
      min-height: 150px;
    }
    
    select option {
      padding: 8px;
    }
    
    select optgroup {
      font-weight: 600;
      color: var(--miku-primary);
    }
    
    .helper-text {
      font-size: 0.75rem;
      color: var(--text-tertiary);
      margin-top: var(--space-xs);
    }
    
    /* ============================================
       BUTTONS
       ============================================ */
    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: var(--space-sm);
      margin-top: var(--space-lg);
    }
    
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: var(--space-sm);
      padding: 12px 24px;
      font-size: 0.9rem;
      font-weight: 600;
      font-family: inherit;
      border: none;
      border-radius: 24px;
      cursor: pointer;
      transition: all var(--transition-fast);
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    
    .btn-primary {
      background: var(--miku-primary);
      color: white;
      box-shadow: var(--shadow-sm);
    }
    
    .btn-primary:hover {
      background: var(--miku-primary-dark);
      box-shadow: var(--shadow-md);
      transform: translateY(-1px);
    }
    
    .btn-secondary {
      background: var(--miku-secondary);
      color: white;
    }
    
    .btn-secondary:hover {
      background: #E91E63;
      box-shadow: var(--shadow-md);
    }
    
    .btn-outline {
      background: transparent;
      color: var(--miku-primary);
      border: 2px solid var(--miku-primary);
    }
    
    .btn-outline:hover {
      background: rgba(57, 197, 187, 0.1);
    }
    
    .btn-ghost {
      background: transparent;
      color: var(--text-secondary);
    }
    
    .btn-ghost:hover {
      background: var(--bg-tertiary);
    }
    
    /* ============================================
       OUTPUT SECTION
       ============================================ */
    .output-section {
      margin-top: var(--space-xl);
      padding: var(--space-lg);
      background: var(--bg-secondary);
      border-radius: 16px;
      border: 2px solid var(--miku-primary);
    }
    
    .output-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: var(--space-md);
    }
    
    .output-title {
      font-size: 1rem;
      font-weight: 600;
      color: var(--miku-primary);
      display: flex;
      align-items: center;
      gap: var(--space-sm);
    }
    
    #output {
      background: var(--bg-primary);
      padding: var(--space-md);
      border-radius: 12px;
      border: 1px solid var(--border-color);
      font-family: 'Roboto Mono', monospace;
      font-size: 0.9rem;
      line-height: 1.6;
      color: var(--text-primary);
      white-space: pre-wrap;
      word-break: break-word;
      min-height: 80px;
    }
    
    .output-actions {
      display: flex;
      flex-wrap: wrap;
      gap: var(--space-sm);
      margin-top: var(--space-md);
    }
    
    /* ============================================
       MODAL - FAVORITES
       ============================================ */
    .modal-overlay {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(0,0,0,0.6);
      backdrop-filter: blur(4px);
      display: none;
      align-items: center;
      justify-content: center;
      z-index: 2000;
      padding: var(--space-md);
    }
    
    .modal-overlay.active {
      display: flex;
    }
    
    .modal {
      background: var(--bg-primary);
      border-radius: 20px;
      width: 100%;
      max-width: 600px;
      max-height: 80vh;
      overflow: hidden;
      box-shadow: var(--shadow-lg);
    }
    
    .modal-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: var(--space-lg);
      border-bottom: 1px solid var(--border-color);
    }
    
    .modal-title {
      font-size: 1.2rem;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: var(--space-sm);
    }
    
    .modal-close {
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--bg-secondary);
      border: none;
      border-radius: 50%;
      color: var(--text-secondary);
      cursor: pointer;
      transition: all var(--transition-fast);
    }
    
    .modal-close:hover {
      background: var(--miku-secondary);
      color: white;
    }
    
    .modal-body {
      padding: var(--space-md);
      max-height: 50vh;
      overflow-y: auto;
    }
    
    .modal-footer {
      display: flex;
      justify-content: flex-end;
      gap: var(--space-sm);
      padding: var(--space-md) var(--space-lg);
      border-top: 1px solid var(--border-color);
    }
    
    /* Favorites List */
    .favorites-list {
      list-style: none;
    }
    
    .favorite-item {
      display: flex;
      align-items: flex-start;
      gap: var(--space-sm);
      padding: var(--space-md);
      background: var(--bg-secondary);
      border-radius: 12px;
      margin-bottom: var(--space-sm);
      transition: all var(--transition-fast);
    }
    
    .favorite-item:hover {
      background: var(--bg-tertiary);
    }
    
    .favorite-text {
      flex: 1;
      font-size: 0.85rem;
      line-height: 1.5;
      word-break: break-word;
    }
    
    .favorite-actions {
      display: flex;
      gap: var(--space-xs);
    }
    
    .icon-btn {
      width: 32px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: transparent;
      border: none;
      border-radius: 8px;
      color: var(--text-secondary);
      cursor: pointer;
      transition: all var(--transition-fast);
    }
    
    .icon-btn:hover {
      background: var(--bg-primary);
      color: var(--miku-primary);
    }
    
    .icon-btn.delete:hover {
      background: #FFEBEE;
      color: #C62828;
    }
    
    .empty-state {
      text-align: center;
      padding: var(--space-xl);
      color: var(--text-tertiary);
    }
    
    .empty-state .material-icons-round {
      font-size: 48px;
      margin-bottom: var(--space-sm);
      opacity: 0.5;
    }
    
    /* Search in modal */
    .search-box {
      margin-bottom: var(--space-md);
    }
    
    .search-box input {
      padding-left: 40px;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='%2379747E'%3E%3Cpath d='M15.5 14h-.79l-.28-.27C15.41 12.59 16 11.11 16 9.5 16 5.91 13.09 3 9.5 3S3 5.91 3 9.5 5.91 16 9.5 16c1.61 0 3.09-.59 4.23-1.57l.27.28v.79l5 4.99L20.49 19l-4.99-5z'/%3E%3C/svg%3E");
      background-repeat: no-repeat;
      background-position: 12px center;
    }
    
    /* ============================================
       SNACKBAR
       ============================================ */
    .snackbar {
      position: fixed;
      bottom: 24px;
      left: 50%;
      transform: translateX(-50%) translateY(100px);
      background: #323033;
      color: white;
      padding: 14px 24px;
      border-radius: 8px;
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      gap: var(--space-md);
      box-shadow: var(--shadow-lg);
      z-index: 3000;
      opacity: 0;
      transition: all var(--transition-normal);
    }
    
    .snackbar.show {
      transform: translateX(-50%) translateY(0);
      opacity: 1;
    }
    
    /* ============================================
       FOOTER
       ============================================ */
    footer {
      text-align: center;
      padding: var(--space-xl) var(--space-md);
      margin-top: var(--space-xl);
      border-top: 1px solid var(--border-color);
    }
    
    footer p {
      color: var(--text-secondary);
      font-size: 0.9rem;
      margin-bottom: var(--space-sm);
    }
    
    footer a {
      color: var(--miku-primary);
      text-decoration: none;
    }
    
    footer a:hover {
      text-decoration: underline;
    }
    
    /* ============================================
       RESPONSIVE DESIGN
       ============================================ */
    @media (max-width: 1024px) {
      /* Tablet: Show horizontal scroll menu */
      .navbar-menu {
        margin-left: var(--space-md);
      }
      
      .navbar-menu a {
        padding: 6px 12px;
        font-size: 0.8rem;
      }
    }
    
    @media (max-width: 768px) {
      /* Mobile: Hide desktop menu, show hamburger */
      .navbar-menu {
        display: none;
      }
      
      .menu-toggle {
        display: flex;
      }
      
      .main-content {
        padding: var(--space-md);
      }
      
      h1 {
        font-size: 1.25rem;
      }
      
      .form-group {
        padding: var(--space-md);
      }
      
      .btn-group {
        flex-direction: column;
      }
      
      .btn {
        width: 100%;
      }
      
      .output-actions {
        flex-direction: column;
      }
      
      .modal {
        max-height: 90vh;
      }
    }
    
    @media (min-width: 769px) {
      /* Desktop: Always hide mobile menu */
      .mobile-menu-overlay,
      .mobile-menu {
        display: none !important;
      }
    }
    
    /* Animation */
    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(10px); }
      to { opacity: 1; transform: translateY(0); }
    }
    
    .form-group {
      animation: fadeIn 0.3s ease-out;
    }