/* Reset và Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 40px;
}

.header-content {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo i {
    font-size: 3rem;
    color: #ffd700;
    text-shadow: 0 0 20px rgba(255, 215, 0, 0.5);
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 300;
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* Generator Card */
.generator-card {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.generator-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.15);
}

.card-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.card-header i {
    font-size: 2rem;
    margin-bottom: 10px;
    display: block;
}

.card-header h2 {
    font-size: 1.8rem;
    font-weight: 600;
}

/* Form Container */
.form-container {
    padding: 40px;
}

.input-group {
    margin-bottom: 30px;
}

.input-group label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
    color: #333;
    margin-bottom: 8px;
    font-size: 1rem;
}

.input-group label i {
    color: #667eea;
    width: 16px;
}

.input-group input,
.input-group select {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #e1e5e9;
    border-radius: 12px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-1px);
}

.input-hint {
    color: #666;
    font-size: 0.85rem;
    margin-top: 5px;
    display: block;
}

/* Generate Button */
.generate-btn {
    width: 100%;
    padding: 18px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    position: relative;
    overflow: hidden;
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.generate-btn:active {
    transform: translateY(0);
}

.generate-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* Progress Bar */
.progress-bar {
    width: 100%;
    height: 6px;
    background: #e1e5e9;
    border-radius: 3px;
    overflow: hidden;
    margin-top: 20px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    width: 0%;
    border-radius: 3px;
    animation: progress 2s ease-in-out;
}

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

/* Result Container */
.result-container {
    margin-top: 30px;
    padding: 30px;
    background: #f8f9fa;
    border-radius: 12px;
    border: 2px solid #e9ecef;
}

.result-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 25px;
}

.result-header i {
    color: #28a745;
    font-size: 1.5rem;
}

.result-header h3 {
    color: #333;
    font-size: 1.3rem;
    font-weight: 600;
}

/* License Output */
.license-output {
    margin-bottom: 25px;
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.output-header span {
    font-weight: 500;
    color: #333;
}

.copy-btn {
    padding: 8px 16px;
    background: #6c757d;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.copy-btn:hover {
    background: #5a6268;
    transform: translateY(-1px);
}

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

#licenseOutput {
    width: 100%;
    height: 200px;
    padding: 15px;
    border: 2px solid #dee2e6;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.4;
    resize: vertical;
    background: white;
}

/* Download Section */
.download-section {
    margin-bottom: 25px;
}

.download-btn {
    padding: 12px 24px;
    background: #28a745;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.download-btn:hover {
    background: #218838;
    transform: translateY(-1px);
}

/* Instructions */
.instructions {
    background: white;
    padding: 25px;
    border-radius: 12px;
    border-left: 4px solid #667eea;
}

.instructions h4 {
    color: #333;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.instructions h4 i {
    color: #667eea;
}

.instructions ol {
    margin-left: 20px;
    margin-bottom: 15px;
}

.instructions li {
    margin-bottom: 8px;
    line-height: 1.6;
}

.instructions code {
    background: #f8f9fa;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    color: #e83e8c;
}

.note {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 8px;
    padding: 15px;
    color: #856404;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.note i {
    color: #f39c12;
    margin-top: 2px;
}

/* Info Cards */
.info-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.info-card {
    background: white;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.info-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.info-icon i {
    font-size: 2rem;
    color: white;
}

.info-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 10px;
}

.info-card p {
    color: #666;
    line-height: 1.6;
}

/* Footer */
.footer {
    margin-top: 60px;
    text-align: center;
}

.footer-content {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 30px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-content p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 15px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: white;
}

/* Modal */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 30px;
    border-radius: 15px;
    width: 90%;
    max-width: 600px;
    position: relative;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    position: absolute;
    right: 20px;
    top: 15px;
}

.close:hover {
    color: #333;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .logo {
        flex-direction: column;
        gap: 10px;
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .logo i {
        font-size: 2.5rem;
    }
    
    .form-container {
        padding: 30px 20px;
    }
    
    .info-cards {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 15px;
    }
    
    .output-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: 30px 15px;
    }
    
    .logo h1 {
        font-size: 1.8rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .form-container {
        padding: 20px 15px;
    }
    
    .input-group input,
    .input-group select {
        padding: 12px 15px;
    }
    
    .generate-btn {
        padding: 15px 20px;
        font-size: 1rem;
    }
}

/* Animation cho loading */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.fa-spin {
    animation: spin 1s linear infinite;
}

/* Smooth transitions */
* {
    transition: all 0.3s ease;
}