.mtios-card {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    border-radius: 16px;
    max-width: 700px;
    margin: 20px auto;
    background: var(--theme-palette-color-9);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.mtios-left {
    flex: 0 0 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 20px;
}

.mtios-qrcode {
    width: 150px;
    height: 150px;
    object-fit: contain;
}

.mtios-placeholder {
    width: 150px;
    height: 150px;
    background: var(--theme-palette-color-21);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--theme-palette-color-14);
    border-radius: 8px;
}

.mtios-right {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.mtios-title {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--theme-palette-color-4);
}

.mtios-desc {
    font-size: 0.9rem;
    color: var(--theme-palette-color-18);
    margin-bottom: 10px;
}

.mtios-form {
    display: flex;
    align-items: center;
    gap: 10px;
}

.mtios-input {
    flex: 1;
    padding: 8px 10px;
    border: none;
    border-bottom: 2px solid var(--theme-palette-color-8);
    border-radius: 0;
    color: var(--theme-palette-color-18);
    background: transparent;
    transition: all 0.2s ease;
}
.mtios-input:focus,
.mtios-input:hover {
    color: var(--theme-palette-color-1);
    border-bottom-color: var(--theme-palette-color-1);
    outline: none;
}

.mtios-btn {
    background: #0073aa;
    color: #fff;
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}
.mtios-btn:hover {
    background: #005f8d;
}
.mtios-btn.success {
    background: #28a745 !important;
}

.mtios-error {
    color: #FF4030;
    font-size: 0.85rem;
    margin-top: 6px;
}

/* 响应式（<500px）自上而下排列 */
@media (max-width: 500px) {
    .mtios-card {
        flex-direction: column;
        text-align: center;
    }
    .mtios-left {
        margin-right: 0;
        margin-bottom: 15px;
    }
    .mtios-form {
        flex-direction: column;
    }
    .mtios-btn {
        width: 100%;
    }
}