body {
    margin: 0;
    padding: 0;
    background-color: #f9f9f9;
    font-family: "Segoe UI", "Helvetica Neue", sans-serif;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: flex-start;
    gap: 40px;
    padding: 60px 40px;
}

.left-panel {
    flex: 0 0 70%;
    margin-left: auto;
    /* 整体偏右居中效果 */
    background: #fff;
    padding: 2em;
    border-radius: 10px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.left-panel h1 {
    text-align: center;
    margin-top: 0;
}

.left-panel textarea {
    width: 100%;
    font-size: 16px;
    padding: 10px;
    border-radius: 4px;
    border: 1px solid #ccc;
    resize: vertical;
}

/* 二维码区域居中 */
#qrcode-container {
    margin: 1.5em auto;
    position: relative;
    width: 400px;
    height: 400px;
    background: #f0f0f0;
    border: 1px dashed #ccc;
    border-radius: 6px;
    display: flex;
    justify-content: center;
    align-items: center;
}

#qrcode-hint {
    position: absolute;
    color: #999;
    font-size: 14px;
    text-align: center;
    pointer-events: none;
}

canvas {
    display: none;
}

.left-panel button {
    display: block;
    margin: 1em auto 0;
    padding: 10px 20px;
    font-size: 16px;
    background-color: #0078d4;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.left-panel button:hover {
    background-color: #005fa3;
}

.right-panel {
    flex: 0 0 30%;
    background: #fff;
    padding: 1.5em;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    text-align: center;
    align-self: flex-start;
}

.right-panel h1 {
    margin-top: 0;
    text-align: left;
}

.right-panel p {
    font-size: 14px;
    color: #555;
    margin-top: 0.8em;
    text-align: left;
}

.right-panel img {
    max-width: 100%;
    border-radius: 8px;
    margin-top: 1em;
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.1);
}

@media (max-width: 900px) {
    .container {
        flex-direction: column;
        padding: 20px;
    }

    .left-panel,
    .right-panel {
        width: 100%;
        margin: 0 auto;
    }

    .right-panel {
        margin-top: 20px;
    }
}