body {
    margin: 0;
    background: #0f1117;
    color: #e8ecf4;
    font-family: Arial, sans-serif;
}

.topbar {
    background: #1a1d27;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #2e3350;
}

.logo {
    font-size: 20px;
    font-weight: 900;
    color: #0ea5e9;
}

.logo span {
    color: #fff;
}

.tabs button {
    background: transparent;
    border: none;
    color: #6b7599;
    margin-left: 10px;
    padding: 6px 10px;
    border-bottom: 2px solid transparent;
    cursor: pointer;
}

.tabs button.active {
    color: #0ea5e9;
    border-bottom-color: #0ea5e9;
}

.page {
    display: none;
    padding: 16px;
}

.page.active {
    display: block;
}

.primary-btn {
    background: #0ea5e9;
    color: white;
    border: none;
    padding: 10px 16px;
    border-radius: 5px;
    font-weight: bold;
    cursor: pointer;
    margin-top: 10px;
}

.scan-box {
    margin-top: 16px;
    background: #1a1d27;
    padding: 16px;
    border-radius: 6px;
    border: 1px solid #2e3350;
    text-align: center;
}

#scanCanvas {
    width: 100%;
    margin-top: 16px;
    background: black;
    border-radius: 6px;
}