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

        body {
            font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 20px;
            position: relative;
            overflow-x: hidden;
        }

        .background-animation {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            z-index: 0;
        }

        .floating-code {
            position: absolute;
            color: rgba(255, 255, 255, 0.1);
            font-family: 'Courier New', monospace;
            font-size: 14px;
            animation: float 20s infinite linear;
            user-select: none;
        }

        @keyframes float {
            0% {
                transform: translateY(100vh) rotate(0deg);
            }

            100% {
                transform: translateY(-100px) rotate(360deg);
            }
        }

        .home-button {
            position: fixed;
            top: 20px;
            left: 20px;
            width: 50px;
            height: 50px;
            background: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(10px);
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.3s ease;
            z-index: 1000;
            text-decoration: none;
            color: white;
            font-size: 20px;
        }

        .home-button:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: translateY(-2px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
        }

        .home-button:active {
            transform: translateY(0);
        }

        .header {
            text-align: center;
            margin-bottom: 30px;
            position: relative;
            z-index: 1;
        }

        .logo {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, #6366f1, #8b5cf6);
            border-radius: 16px;
            margin: 0 auto 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
            animation: pulse 2s infinite;
        }

        @keyframes pulse {

            0%,
            100% {
                transform: scale(1);
            }

            50% {
                transform: scale(1.05);
            }
        }

        .logo::before {
            content: '</>';
            color: white;
            font-size: 24px;
            font-weight: bold;
        }

        .page-title {
            color: white;
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 8px;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
        }

        .page-subtitle {
            color: rgba(255, 255, 255, 0.8);
            font-size: 16px;
        }

        .nav-tabs {
            display: flex;
            justify-content: center;
            margin-bottom: 30px;
            gap: 10px;
            position: relative;
            z-index: 1;
        }

        .nav-tab {
            padding: 12px 24px;
            background: rgba(255, 255, 255, 0.2);
            color: white;
            border: none;
            border-radius: 25px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 600;
            backdrop-filter: blur(10px);
        }

        .nav-tab:hover {
            background: rgba(255, 255, 255, 0.3);
        }

        .nav-tab.active {
            background: rgba(255, 255, 255, 0.9);
            color: #667eea;
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
        }

        .submission-container {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            position: relative;
            z-index: 1;
        }

        .management-container {
            max-width: 1200px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .submission-card,
        .management-card {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(20px);
            border-radius: 24px;
            padding: 30px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            transform: translateY(20px);
            opacity: 0;
            animation: slideUp 0.8s ease-out forwards;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .submission-card:hover,
        .management-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
        }

        .submission-card:nth-child(1) {
            animation-delay: 0.2s;
        }

        .submission-card:nth-child(2) {
            animation-delay: 0.4s;
        }

        .submission-card:nth-child(3) {
            animation-delay: 0.6s;
        }

        @keyframes slideUp {
            to {
                transform: translateY(0);
                opacity: 1;
            }
        }

        .card-icon {
            width: 50px;
            height: 50px;
            border-radius: 12px;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: white;
            font-weight: bold;
        }

        .text-submission .card-icon {
            background: linear-gradient(135deg, #10b981, #059669);
        }

        .file-submission .card-icon {
            background: linear-gradient(135deg, #f59e0b, #d97706);
        }

        .zip-submission .card-icon {
            background: linear-gradient(135deg, #8b5cf6, #7c3aed);
        }

        .management-card .card-icon {
            background: linear-gradient(135deg, #ef4444, #dc2626);
        }

        .card-title {
            font-size: 24px;
            font-weight: 700;
            color: #1f2937;
            margin-bottom: 8px;
        }

        .card-description {
            color: #6b7280;
            margin-bottom: 25px;
            line-height: 1.6;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-label {
            display: block;
            font-weight: 600;
            color: #374151;
            margin-bottom: 8px;
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .form-input,
        .form-select {
            width: 100%;
            padding: 16px 20px;
            border: 2px solid #e5e7eb;
            border-radius: 12px;
            font-size: 16px;
            transition: all 0.3s ease;
            background: #f9fafb;
            outline: none;
        }

        .form-input:focus,
        .form-select:focus {
            border-color: #6366f1;
            background: white;
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
            transform: translateY(-2px);
        }

        .code-textarea {
            min-height: 200px;
            font-family: 'Courier New', monospace;
            resize: vertical;
        }

        .file-upload-area {
            border: 2px dashed #d1d5db;
            border-radius: 12px;
            padding: 30px;
            text-align: center;
            transition: all 0.3s ease;
            cursor: pointer;
            background: #f9fafb;
        }

        .file-upload-area:hover,
        .file-upload-area.dragover {
            border-color: #6366f1;
            background: #eef2ff;
        }

        .file-upload-icon {
            font-size: 48px;
            color: #9ca3af;
            margin-bottom: 12px;
        }

        .file-upload-text {
            color: #6b7280;
            font-size: 16px;
            margin-bottom: 8px;
        }

        .file-upload-subtext {
            color: #9ca3af;
            font-size: 14px;
        }

        .file-input {
            display: none;
        }

        .submit-btn,
        .action-btn {
            width: 100%;
            padding: 18px;
            background: linear-gradient(135deg, #6366f1, #8b5cf6);
            color: white;
            border: none;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-transform: uppercase;
            letter-spacing: 1px;
            position: relative;
            overflow: hidden;
            margin-bottom: 10px;
        }

        .submit-btn:hover,
        .action-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 15px 35px rgba(99, 102, 241, 0.4);
        }

        .submit-btn:active,
        .action-btn:active {
            transform: translateY(0);
        }

        .submit-btn:disabled,
        .action-btn:disabled {
            opacity: 0.7;
            cursor: not-allowed;
            transform: none;
        }

        .btn-loading {
            display: none;
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }

        .btn-text {
            transition: opacity 0.3s ease;
        }

        .spinner {
            width: 20px;
            height: 20px;
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: white;
            animation: spin 1s ease-in-out infinite;
        }

        @keyframes spin {
            to {
                transform: rotate(360deg);
            }
        }

        .success-message,
        .error-message {
            padding: 16px;
            border-radius: 12px;
            margin-bottom: 20px;
            text-align: center;
            display: none;
            animation: slideDown 0.3s ease-out;
        }

        .success-message {
            background: linear-gradient(135deg, #10b981, #059669);
            color: white;
        }

        .error-message {
            background: linear-gradient(135deg, #ef4444, #dc2626);
            color: white;
        }

        @keyframes slideDown {
            from {
                transform: translateY(-20px);
                opacity: 0;
            }

            to {
                transform: translateY(0);
                opacity: 1;
            }
        }

        .selected-file {
            background: #eef2ff;
            border: 2px solid #6366f1;
            padding: 12px 16px;
            border-radius: 8px;
            margin-top: 12px;
            display: none;
            align-items: center;
            gap: 12px;
        }

        .file-icon {
            font-size: 20px;
            color: #6366f1;
        }

        .file-info {
            flex: 1;
        }

        .file-name {
            font-weight: 600;
            color: #1f2937;
        }

        .file-size {
            font-size: 12px;
            color: #6b7280;
        }

        .remove-file {
            background: none;
            border: none;
            color: #ef4444;
            cursor: pointer;
            font-size: 18px;
            padding: 4px;
            border-radius: 4px;
            transition: background-color 0.2s ease;
        }

        .remove-file:hover {
            background: rgba(239, 68, 68, 0.1);
        }

        .submissions-list {
            max-height: 400px;
            overflow-y: auto;
            border: 1px solid #e5e7eb;
            border-radius: 12px;
            background: #f9fafb;
        }

        .submission-item {
            padding: 16px;
            border-bottom: 1px solid #e5e7eb;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .submission-item:last-child {
            border-bottom: none;
        }

        .submission-info {
            flex: 1;
        }

        .submission-id {
            font-weight: 600;
            color: #1f2937;
        }

        .submission-details {
            font-size: 14px;
            color: #6b7280;
            margin-top: 4px;
        }

        .submission-actions {
            display: flex;
            gap: 8px;
        }

        .btn-small {
            padding: 6px 12px;
            font-size: 12px;
            border-radius: 6px;
            border: none;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .btn-view {
            background: #3b82f6;
            color: white;
        }

        .btn-delete {
            background: #ef4444;
            color: white;
        }

        .btn-review {
            background: #10b981;
            color: white;
        }

        .btn-small:hover {
            transform: translateY(-1px);
        }

        .code-display {
            background: #1f2937;
            color: #f9fafb;
            padding: 20px;
            border-radius: 12px;
            font-family: 'Courier New', monospace;
            max-height: 400px;
            overflow-y: auto;
            white-space: pre-wrap;
            margin-top: 16px;
        }

        .review-display {
            background: #f3f4f6;
            padding: 20px;
            border-radius: 12px;
            margin-top: 16px;
            max-height: 400px;
            overflow-y: auto;
        }

        @media (max-width: 768px) {
            .submission-container {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .submission-card,
            .management-card {
                padding: 20px;
            }

            .page-title {
                font-size: 24px;
            }

            .nav-tabs {
                flex-wrap: wrap;
            }
        }

        .language-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
            gap: 12px;
            margin-top: 8px;
        }

        .language-option {
            position: relative;
        }

        .language-option input[type="radio"] {
            position: absolute;
            opacity: 0;
        }

        .language-label {
            display: block;
            padding: 12px 16px;
            border: 2px solid #e5e7eb;
            border-radius: 8px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            background: #f9fafb;
            font-weight: 500;
            font-size: 14px;
        }

        .language-option input[type="radio"]:checked+.language-label {
            border-color: #6366f1;
            background: #eef2ff;
            color: #6366f1;
            transform: scale(1.02);
        }