:root {
            --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
            --tech-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            --accent-color: #00f2fe;
        }

        /* Dark Theme (Default) */
        [data-theme="dark"] {
            --bg-primary: #0a0a0a;
            --bg-secondary: #1a1a1a;
            --card-bg: rgba(255, 255, 255, 0.05);
            --text-primary: #ffffff;
            --text-secondary: rgba(255, 255, 255, 0.8);
            --border-color: rgba(255, 255, 255, 0.1);
            --navbar-bg: rgba(10, 10, 10, 0.9);
            --navbar-bg-scrolled: rgba(10, 10, 10, 0.95);
            --dropdown-bg: rgba(10, 10, 10, 0.95);
        }

        /* Light Theme */
        [data-theme="light"] {
            --bg-primary: #ffffff;
            --bg-secondary: #f8f9fa;
            --card-bg: rgba(0, 0, 0, 0.05);
            --text-primary: #1a1a1a;
            --text-secondary: rgba(0, 0, 0, 0.7);
            --border-color: rgba(0, 0, 0, 0.1);
            --navbar-bg: rgba(255, 255, 255, 0.9);
            --navbar-bg-scrolled: rgba(255, 255, 255, 0.95);
            --dropdown-bg: rgba(255, 255, 255, 0.95);
        }

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

        body {
            background: var(--bg-primary);
            color: var(--text-primary);
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            padding-top: 80px;
            transition: background-color 0.3s ease, color 0.3s ease;
        }

        /* Animated background */
        .bg-animation {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            background: radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
                        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
                        radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.2) 0%, transparent 50%);
            animation: backgroundShift 20s ease-in-out infinite;
        }

        @keyframes backgroundShift {
            0%, 100% { transform: scale(1) rotate(0deg); }
            50% { transform: scale(1.1) rotate(5deg); }
        }

        /* Modern Navigation */
        .navbar-modern {
            background: var(--navbar-bg);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-color);
            padding: 1rem 0;
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            transition: all 0.3s ease;
        }

        .navbar-modern .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .navbar-brand-modern {
            font-size: 1.5rem;
            font-weight: 700;
            background: var(--tech-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            animation: pulse 2s ease-in-out infinite;
        }

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

        .brand-icon {
            width: 32px;
            height: 32px;
            border-radius: 8px;
            overflow: hidden;
            flex-shrink: 0;
        }

        .brand-icon img {
            width: 100%;
            height: 100%;
            display: block;
        }

        .navbar-nav-modern {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .nav-dropdown {
            position: relative;
        }

        .nav-link-modern {
            color: var(--text-primary);
            text-decoration: none;
            padding: 0.5rem 1rem;
            border-radius: 8px;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 500;
        }

        .nav-link-modern:hover {
            color: var(--accent-color);
            background: rgba(79, 172, 254, 0.1);
        }

        .dropdown-menu-modern {
            position: absolute;
            top: 100%;
            right: 0;
            background: var(--dropdown-bg);
            backdrop-filter: blur(20px);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 0.5rem 0;
            min-width: 200px;
            opacity: 0;
            visibility: hidden;
            transform: translateY(-10px);
            transition: all 0.3s ease;
            list-style: none;
            margin: 0;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
        }

        .nav-dropdown:hover .dropdown-menu-modern {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .dropdown-item-modern {
            color: var(--text-secondary);
            text-decoration: none;
            padding: 0.75rem 1rem;
            display: flex;
            align-items: center;
            gap: 0.75rem;
            transition: all 0.3s ease;
        }

        .dropdown-item-modern:hover {
            color: var(--text-primary);
            background: rgba(79, 172, 254, 0.1);
        }

        .dropdown-divider-modern {
            height: 1px;
            background: var(--border-color);
            border: none;
            margin: 0.5rem 0;
        }

        .theme-toggle {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 20px;
            padding: 0.5rem;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .theme-toggle:hover {
            background: rgba(79, 172, 254, 0.1);
            border-color: var(--accent-color);
        }

        .theme-toggle i {
            color: var(--text-secondary);
            transition: all 0.3s ease;
        }

        .theme-toggle:hover i {
            color: var(--accent-color);
        }

        @media (max-width: 768px) {
            .navbar-nav-modern {
                display: none;
            }
            
            .page-title {
                font-size: 2rem;
            }
            
            .tool-icon-large {
                width: 80px;
                height: 80px;
                font-size: 2rem;
            }
            
            .feature-badges {
                flex-direction: column;
                align-items: center;
            }
            
            .badge-modern {
                width: fit-content;
            }
        }

        /* Page Header */
        .page-header {
            padding: 4rem 0 2rem;
            text-align: center;
        }

        .tool-icon-large {
            width: 120px;
            height: 120px;
            margin: 0 auto;
            background: var(--tech-gradient);
            border-radius: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 3rem;
            color: white;
            animation: float 6s ease-in-out infinite;
            box-shadow: 0 20px 40px rgba(79, 172, 254, 0.3);
        }

        @keyframes float {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(-10px); }
        }

        .page-title {
            font-size: 3rem;
            font-weight: 800;
            background: var(--tech-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }

        .page-subtitle {
            font-size: 1.25rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.6;
        }

        .feature-badges {
            display: flex;
            justify-content: center;
            gap: 1rem;
            flex-wrap: wrap;
        }

        .badge-modern {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
            padding: 0.5rem 1rem;
            border-radius: 25px;
            font-size: 0.875rem;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            transition: all 0.3s ease;
            backdrop-filter: blur(10px);
        }

        .badge-modern:hover {
            background: rgba(79, 172, 254, 0.1);
            border-color: var(--accent-color);
            transform: translateY(-2px);
        }

        .badge-modern i {
            color: var(--accent-color);
        }

        /* Tool Container */
        .tool-container {
            padding: 3rem 0;
        }

        .tool-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 20px;
            padding: 2rem;
            backdrop-filter: blur(20px);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
            width: 100%;
            box-sizing: border-box;
        }

        .tool-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: var(--tech-gradient);
            transform: scaleX(0);
            transition: transform 0.3s ease;
        }

        .tool-card:hover {
            transform: translateY(-5px);
            border-color: rgba(79, 172, 254, 0.5);
            box-shadow: 0 20px 40px rgba(79, 172, 254, 0.1);
        }

        .tool-card:hover::before {
            transform: scaleX(1);
        }

        .form-control-modern {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 1rem;
            color: var(--text-primary);
            transition: all 0.3s ease;
            width: 100%;
            box-sizing: border-box;
        }

        .form-control-modern:focus {
            background: var(--card-bg);
            border-color: var(--accent-color);
            box-shadow: 0 0 0 0.2rem rgba(79, 172, 254, 0.25);
            color: var(--text-primary);
        }

        .form-control-modern::placeholder {
            color: var(--text-secondary);
        }

        /* Specific styles for textarea */
        textarea.form-control-modern {
            resize: vertical;
            min-height: 200px;
            font-family: 'Courier New', monospace;
            font-size: 0.9rem;
            line-height: 1.4;
            width: 100% !important;
            max-width: 100%;
            display: block;
        }

        /* Ensure the XML output specifically takes full width */
        #xmlOutput {
            width: 100% !important;
            box-sizing: border-box !important;
            margin: 0 !important;
            padding: 1rem !important;
        }

        /* Ensure all form elements in the tool card take full width */
        .tool-card .form-control-modern,
        .tool-card textarea,
        .tool-card input[type="text"],
        .tool-card input[type="email"] {
            width: 100% !important;
            box-sizing: border-box !important;
        }

        .btn-modern {
            background: var(--tech-gradient);
            border: none;
            padding: 12px 30px;
            border-radius: 50px;
            color: white;
            font-weight: 600;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .btn-modern::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: left 0.5s ease;
        }

        .btn-modern:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 25px rgba(79, 172, 254, 0.4);
            color: white;
        }

        .btn-modern:hover::before {
            left: 100%;
        }

        .btn-modern:disabled {
            background: rgba(255, 255, 255, 0.1);
            color: var(--text-secondary);
            cursor: not-allowed;
        }

        .btn-modern:disabled:hover {
            transform: none;
            box-shadow: none;
        }

        .result-container {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 1.5rem;
            margin-top: 2rem;
            width: 100%;
            box-sizing: border-box;
        }

        .alert-modern {
            border-radius: 12px;
            border: none;
            padding: 1rem 1.5rem;
        }

        .alert-success {
            background: rgba(34, 197, 94, 0.1);
            color: #22c55e;
            border: 1px solid rgba(34, 197, 94, 0.2);
        }

        .alert-danger {
            background: rgba(239, 68, 68, 0.1);
            color: #ef4444;
            border: 1px solid rgba(239, 68, 68, 0.2);
        }
        
        /* Upload Area Styles */
        .upload-area {
            border: 2px dashed var(--border-color);
            border-radius: 15px;
            background: var(--card-bg);
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .upload-area::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: var(--tech-gradient);
            transform: scaleX(0);
            transition: transform 0.3s ease;
        }
        
        .upload-area:hover {
            border-color: var(--accent-color);
            background: rgba(79, 172, 254, 0.05);
            transform: translateY(-2px);
        }

        .upload-area:hover::before {
            transform: scaleX(1);
        }
        
        .upload-area.highlight {
            border-color: var(--accent-color);
            background: rgba(79, 172, 254, 0.1);
            box-shadow: 0 10px 30px rgba(79, 172, 254, 0.2);
        }

        .upload-area p {
            color: var(--text-secondary);
            margin: 0;
        }

        .upload-area #dropText,
        .upload-area #dropTextMp4 {
            color: var(--text-primary);
            font-weight: 500;
        }
        
        /* Hidden file input */
        #mp4FileInput {
            display: none;
        }

/* MP4 → GIF */
.mp4-progress-wrap {
  height: 8px;
  background: var(--border-color);
  border-radius: 999px;
  overflow: hidden;
  margin: 1rem 0;
  display: none;
}
.mp4-progress-wrap.visible { display: block; }
.mp4-progress-bar {
  height: 100%;
  width: 0%;
  background: var(--tech-gradient);
  border-radius: 999px;
  transition: width 0.2s ease;
}
.status-line { min-height: 1.5em; font-size: 0.95rem; color: var(--text-secondary); }
.status-line.error { color: #ef4444; }
.privacy-note { font-size: 0.8rem; color: var(--text-secondary); margin-top: 1.5rem; line-height: 1.5; }
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0;
}