* {
    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;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    max-width: 1200px;
    width: 100%;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
}

.main-title {
    text-align: center;
    color: #333;
    margin-bottom: 40px;
    font-size: 32px;
    font-weight: 700;
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.section {
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 12px;
    padding: 30px;
    transition: all 0.3s ease;
}

.section:hover {
    border-color: #667eea;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.1);
}

h2 {
    color: #333;
    margin-bottom: 24px;
    font-size: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding-bottom: 16px;
    border-bottom: 2px solid #e9ecef;
}

input[type="file"] {
    width: 100%;
    padding: 12px;
    border: 2px dashed #667eea;
    border-radius: 8px;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

input[type="file"]:hover {
    border-color: #764ba2;
    background: #f8f9ff;
}

input[type="number"],
input[type="text"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    margin-top: 8px;
}

input[type="number"]:focus,
input[type="text"]:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

label {
    display: block;
    color: #555;
    font-weight: 500;
    margin-top: 16px;
    margin-bottom: 4px;
}

button {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 16px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

#uploadResult {
    margin-top: 20px;
    padding: 16px;
    border-radius: 8px;
    background: #e7f3ff;
    border-left: 4px solid #0066cc;
    display: none;
}

#uploadResult:not(:empty) {
    display: block;
}

.result-item {
    margin: 10px 0;
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: center;
}

.code-display {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    font-weight: bold;
    color: #667eea;
}

.copy-btn {
    background: #667eea;
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.3s ease;
    width: auto;
    margin: 0;
    box-shadow: none;
}

.copy-btn:hover {
    background: #764ba2;
    transform: scale(1.05);
}

.copy-btn.copied {
    background: #28a745;
}

.download-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.3);
}

.download-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(40, 167, 69, 0.5);
}

.success-message {
    color: #28a745;
    font-weight: 600;
    margin-bottom: 12px;
}

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

    .container {
        padding: 24px;
    }

    .main-title {
        font-size: 24px;
        margin-bottom: 30px;
    }

    h2 {
        font-size: 20px;
    }

    .section {
        padding: 20px;
    }
}

#progressContainer {
    margin-top: 16px;
}

.progress-bar {
    width: 100%;
    height: 24px;
    background: #e9ecef;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    width: 0%;
    transition: width 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 8px;
    color: white;
    font-size: 12px;
    font-weight: 600;
}

.progress-text {
    text-align: center;
    margin-top: 8px;
    color: #667eea;
    font-weight: 600;
    font-size: 14px;
}