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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #121212;
    min-height: 100vh;
    color: #e0e0e0;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 40px;
    color: #e0e0e0;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

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

main {
    flex: 1;
    background: #1e1e1e;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

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

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

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #b0b0b0;
}

#urlInput {
    width: 100%;
    padding: 15px;
    border: 2px solid #333;
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.3s ease;
    background-color: #2a2a2a;
    color: #e0e0e0;
}

#urlInput:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.controls {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5a6fd8;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

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

.btn-success {
    background: #28a745;
    color: white;
}

.btn-success:hover {
    background: #218838;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(40, 167, 69, 0.4);
}

.btn-info {
    background: #17a2b8;
    color: white;
}

.btn-info:hover {
    background: #138496;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(23, 162, 184, 0.4);
}

.qr-section {
    text-align: center;
    animation: fadeIn 0.5s ease-in-out;
}

.qr-section h2 {
    margin-bottom: 25px;
    color: #d0d0d0;
    font-size: 1.8rem;
}

.qr-container {
    background: #2a2a2a;
    padding: 30px;
    border-radius: 15px;
    margin-bottom: 25px;
    border: 2px dashed #444;
}

#qrcode {
    display: inline-block;
}

#qrcode canvas,
#qrcode img {
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.qr-info {
    background: #333;
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 25px;
    word-break: break-all;
}

.qr-info p {
    margin: 0;
    font-size: 14px;
}

.download-section {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

footer {
    text-align: center;
    margin-top: 30px;
    color: #888;
    opacity: 0.8;
}

.error-message {
    background: #2c1a1d;
    color: #ff6b70;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid #3e2427;
}

.success-message {
    background: #1a2c1d;
    color: #78d485;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid #274127;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    main {
        padding: 20px;
    }
    
    .controls {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
    
    .download-section {
        flex-direction: column;
    }
}