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

.container {
    width: 100%;
    max-width: 900px;
    padding: 20px;
}

.login-card, .scanner-card {
    background: white;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    text-align: center;
}

h1 {
    color: #333;
    margin-bottom: 30px;
    font-size: 2.5em;
    font-weight: 300;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

.login-btn, .btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s ease;
    margin: 5px;
}

.login-btn:hover, .btn:hover {
    transform: translateY(-2px);
}

.error-message {
    color: #e74c3c;
    margin-top: 15px;
    font-size: 14px;
    min-height: 20px;
}

/* Scanner Styles */
.scanner-container {
    position: relative;
    margin: 20px 0;
    display: inline-block;
}

#video {
    border-radius: 10px;
    border: 3px solid #667eea;
}

.scanner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.scanner-frame {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    border: 3px solid #667eea;
    border-radius: 10px;
    box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.5);
}

.scanner-controls {
    margin: 20px 0;
}

.logout-btn {
    background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
}

.scan-result {
    margin-top: 20px;
    min-height: 50px;
    word-break: break-all;
}

/* Responsive Design */
@media (max-width: 900px) {
    .container {
        max-width: 95%;
        padding: 10px;
    }
    
    .login-card, .scanner-card {
        padding: 30px 20px;
    }
    
    h1 {
        font-size: 2em;
    }
    
    #video {
        width: 100%;
        height: auto;
    }
    
    .scanner-frame {
        width: 150px;
        height: 150px;
    }
}