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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;
}

.header {
    text-align: center;
    margin-bottom: 50px;
    color: white;
}

.header h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.upload-section {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.file-upload-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 40px;
}

.file-upload-box {
    border: 3px dashed #ddd;
    border-radius: 15px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.file-upload-box:hover {
    border-color: #667eea;
    background-color: #f8f9ff;
}

.file-upload-box.drag-over {
    border-color: #667eea;
    background-color: #f0f4ff;
    transform: scale(1.02);
}

.file-upload-box.has-file {
    border-color: #28a745;
    background-color: #f8fff8;
}

.upload-content i {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 15px;
}

.upload-content h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #333;
}

.upload-content p {
    color: #666;
    margin-bottom: 15px;
}

.browse-btn {
    display: inline-block;
    padding: 10px 25px;
    background: #667eea;
    color: white;
    border-radius: 25px;
    font-size: 0.9rem;
    transition: background 0.3s ease;
}

.browse-btn:hover {
    background: #5a67d8;
}

.file-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: #28a745;
    font-weight: 500;
}

.file-info i {
    font-size: 1.5rem;
}

.remove-file {
    background: #dc3545;
    color: white;
    border: none;
    border-radius: 50%;
    width: 25px;
    height: 25px;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
}

.process-btn {
    display: block;
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
    padding: 18px 40px;
    background: linear-gradient(135deg, #28a745, #20c997);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.3);
}

.process-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(40, 167, 69, 0.4);
}

.process-btn:disabled {
    background: #6c757d;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.progress-section {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    text-align: center;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e9ecef;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 20px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 4px;
    animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

.progress-text {
    color: #666;
    font-size: 1.1rem;
}

.logs-section {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.logs-section h3 {
    margin-bottom: 20px;
    color: #333;
}

.logs-list {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 20px;
    max-height: 300px;
    overflow-y: auto;
}

.log-entry {
    padding: 8px 0;
    border-bottom: 1px solid #e9ecef;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
    color: #495057;
}

.log-entry:last-child {
    border-bottom: none;
}

.log-entry.warning {
    color: #856404;
}

.result-section {
    background: white;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    text-align: center;
}

.success-message i {
    font-size: 4rem;
    color: #28a745;
    margin-bottom: 20px;
}

.success-message h3 {
    color: #28a745;
    margin-bottom: 10px;
    font-size: 1.8rem;
}

.success-message p {
    color: #666;
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.download-btn {
    display: inline-block;
    padding: 15px 40px;
    background: linear-gradient(135deg, #17a2b8, #138496);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(23, 162, 184, 0.3);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(23, 162, 184, 0.4);
    text-decoration: none;
    color: white;
}

.error-section {
    background: white;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    text-align: center;
}

.error-message i {
    font-size: 4rem;
    color: #dc3545;
    margin-bottom: 20px;
}

.error-message h3 {
    color: #dc3545;
    margin-bottom: 10px;
    font-size: 1.8rem;
}

.error-message p {
    color: #666;
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.reset-btn {
    padding: 15px 40px;
    background: #6c757d;
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.reset-btn:hover {
    background: #5a6268;
    transform: translateY(-2px);
}

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

    .header h1 {
        font-size: 2rem;
    }

    .container {
        padding: 20px 15px;
    }

    .upload-section {
        padding: 25px;
    }
}