* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', system-ui, sans-serif;
        }

        body {
            background: linear-gradient(145deg, #0b1120 0%, #1a2538 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 1rem;
        }

        .card {
            max-width: 750px;
            width: 100%;
            background: #ffffff10;
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid #ffffff30;
            border-radius: 2rem;
            padding: 2rem;
            box-shadow: 0 25px 50px -12px #00000080;
        }

        h1 {
            font-size: 2.2rem;
            font-weight: 600;
            color: white;
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-bottom: 0.5rem;
        }

        h1 i {
            background: #ffffff20;
            padding: 0.5rem;
            border-radius: 1rem;
        }

        .sub {
            color: #cbd5e0;
            margin-bottom: 2rem;
            font-size: 1rem;
        }

        .drop-zone {
            background: #1e293b80;
            border: 2px dashed #64748b;
            border-radius: 1.5rem;
            padding: 2.5rem;
            text-align: center;
            cursor: pointer;
            transition: all 0.2s;
        }

        .drop-zone:hover {
            border-color: #60a5fa;
            background: #1e293bdd;
        }

        .drop-zone i {
            font-size: 4rem;
            color: #60a5fa;
            margin-bottom: 1rem;
        }

        .drop-zone h3 {
            font-size: 1.6rem;
            color: #f1f5f9;
            margin-bottom: 0.5rem;
        }

        .drop-zone p {
            color: #94a3b8;
        }

        .file-input {
            display: none;
        }

        .file-btn {
            background: #3b82f6;
            color: white;
            border: none;
            padding: 0.8rem 2rem;
            border-radius: 3rem;
            font-size: 1rem;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 0.7rem;
            cursor: pointer;
            margin-top: 1.2rem;
            border: 1px solid #60a5fa;
            transition: 0.15s;
        }

        .file-btn:hover {
            background: #2563eb;
            transform: scale(1.02);
        }

        .info-panel {
            background: #1e293b80;
            border-radius: 1.5rem;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border: 1px solid #334155;
            display: none;
        }

        .info-panel.show {
            display: block;
        }

        .info-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            margin-bottom: 1rem;
        }

        .badge {
            background: #2d3b4f;
            padding: 0.5rem 1.2rem;
            border-radius: 2rem;
            color: #e2e8f0;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .badge i {
            color: #60a5fa;
        }

        .convert-btn {
            width: 100%;
            background: linear-gradient(145deg, #2563eb, #1d4ed8);
            color: white;
            border: none;
            padding: 1.2rem;
            border-radius: 3rem;
            font-size: 1.2rem;
            font-weight: 600;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.8rem;
            cursor: pointer;
            margin: 1.5rem 0;
            border: 1px solid #3b82f6;
            transition: 0.15s;
        }

        .convert-btn:not(:disabled):hover {
            background: linear-gradient(145deg, #3b82f6, #2563eb);
            transform: translateY(-2px);
            box-shadow: 0 15px 25px -8px #1e3a8a;
        }

        .convert-btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

        .download-btn {
            width: 100%;
            background: #059669;
            color: white;
            border: none;
            padding: 1.2rem;
            border-radius: 3rem;
            font-size: 1.2rem;
            font-weight: 600;
            display: none;
            align-items: center;
            justify-content: center;
            gap: 0.8rem;
            cursor: pointer;
            margin: 1rem 0;
            border: 1px solid #10b981;
        }

        .download-btn.show {
            display: flex;
        }

        .download-btn:hover {
            background: #047857;
        }

        .progress-container {
            margin: 1.5rem 0;
        }

        .progress-bar {
            height: 0.8rem;
            background: #2d3b4f;
            border-radius: 1rem;
            overflow: hidden;
        }

        .progress-fill {
            height: 100%;
            width: 0%;
            background: linear-gradient(90deg, #3b82f6, #8b5cf6);
            border-radius: 1rem;
            transition: width 0.15s;
        }

        .progress-stats {
            display: flex;
            justify-content: space-between;
            color: #94a3b8;
            font-size: 0.9rem;
            margin-top: 0.5rem;
        }

        .preview-box {
            background: #1e293b80;
            border-radius: 1.2rem;
            padding: 1.2rem;
            margin-top: 1.5rem;
            border: 1px solid #334155;
            display: none;
        }

        .preview-box.show {
            display: block;
        }

        .preview-title {
            color: #f1c40f;
            margin-bottom: 0.8rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .preview-content {
            background: #0f172a;
            padding: 1rem;
            border-radius: 0.8rem;
            color: #cbd5e1;
            max-height: 200px;
            overflow-y: auto;
            white-space: pre-wrap;
            font-size: 0.9rem;
            border: 1px solid #475569;
        }

        .footer-note {
            color: #64748b;
            text-align: center;
            font-size: 0.85rem;
            margin-top: 1.5rem;
        }

        .success-message {
            color: #4ade80;
            margin-top: 0.5rem;
            font-size: 0.9rem;
            display: none;
        }

        .success-message.show {
            display: block;
        }