/* 响应式：移动端适配 */
@media (max-width: 1400px) { .app-card { max-width: calc(16.666% - var(--spacing-md)); } }
@media (max-width: 1000px) { .app-card { max-width: calc(20% - var(--spacing-md)); } }
@media (max-width: 767px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.show { transform: translateX(0); }
    .main-content { margin-left: 0; width: 100%; }
    .menu-btn { display: flex; }
    .header {
        flex-wrap: wrap;
        align-items: center;
        gap: var(--spacing-sm);
        padding: var(--spacing-md);
    }
    .menu-btn { order: 1; }
    .header-title-wrapper { order: 2; flex: 1; text-align: left; margin: 0; }
    .search-container { order: 3; max-width: 100% !important; width: 100%; margin-top: var(--spacing-xs); }
    .app-card { max-width: calc(33.333% - var(--spacing-md)); }
}

@media (max-width: 500px) {
    .app-card { max-width: calc(50% - var(--spacing-md)); }
    .app-popup {
        padding: var(--spacing-md);
        max-height: 75vh;
    }
    .qr-code-container {
        width: 140px;
        height: 140px;
    }
    .detail-btn {
        padding: var(--spacing-xs);
        font-size: 13px;
    }
}

@media (max-width: 360px) { .app-card { max-width: 100%; } }

/* 状态样式：空状态、加载失败、全局加载 */
.empty-state {
    width: 100%;
    padding: 40px 0;
    text-align: center;
    color: var(--color-gray);
}

.empty-state-icon { font-size: 60px; margin-bottom: 16px; }
.empty-state-text { font-size: 16px; margin-bottom: 8px; }
.empty-state-tip { font-size: 14px; color: #bbb; }

.load-fail-state {
    width: 100%;
    padding: 40px 0;
    text-align: center;
    color: var(--color-gray);
}

.load-fail-icon { font-size: 60px; margin-bottom: 16px; color: var(--color-danger); }
.load-fail-text { font-size: 16px; margin-bottom: 8px; }
.load-fail-detail { font-size: 14px; color: #888; margin-bottom: 16px; }

.retry-btn {
    padding: 8px 24px;
    background-color: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--border-radius-lg);
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.retry-btn:hover {
    background-color: #66b1ff;
    box-shadow: 0 2px 8px rgba(64, 158, 255, 0.3);
}

.global-loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-light);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(64, 158, 255, 0.2);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

.loading-text {
    font-size: 16px;
    color: var(--color-gray);
}