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

body {
    font-family: 'Segoe UI', sans-serif;
    line-height: 1.5;
    background: #fcfcf1;
    color: #000000;
}

.container {
    max-width: 900px;
    margin: 2rem auto;
    padding: 20px;
    background: #f5f5f5;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: #2c3e50;
}

.tab-container {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.tab-btn {
    padding: 4px 6px;
    border: 2px solid #ddd;
    background: #ffffff;
    cursor: pointer;
    font-size: 1.1rem;
    color: #666;
    border-radius: 5px;
    transition: all 0.1s ease;
}

.tab-btn.active {
    color: #8d4bbb;
    border-color: #8d4bbb;
    background: #f8f1ff;
}

.tab-btn:hover {
    color: #8d4bbb;
    border-color: #8d4bbb;
    background: #fafafa;
}

.qr-pane {
    display: none;
    text-align: center;
}

.qr-pane.active {
    display: block;
}

.qr-pane img {
    max-width: 300px;
    height: auto;
    margin: 0 auto 1rem;
    border: 1px solid #ddd;
    padding: 10px;
    border-radius: 8px;
}

@media (max-width: 768px) {
    .tab-container {
        flex-direction: column;
    }
    
    .tab-btn {
        width: 100%;
        padding: 10px;
    }
}