/* Multi-Select Dropdown Component - CSS Styles */
/* 独立的多选组件样式，支持主题切换和响应式设计 */

/* ========== MULTI-SELECT DROPDOWN COMPONENT ========== */

.multi-select-wrapper {
    position: relative;
    width: 100%;
}

/* ========== 显示区域 ========== */
.multi-select-display {
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 0.5rem 0.75rem;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.multi-select-display:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.multi-select-display:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
}

.multi-select-display[aria-expanded="true"] {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
}

.multi-select-content {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-height: 20px;
    overflow: hidden;
}

.multi-select-arrow {
    color: var(--text-muted);
    transition: transform 0.2s ease, color 0.2s ease;
    font-size: 14px;
    margin-left: 0.5rem;
}

.multi-select-display:hover .multi-select-arrow {
    color: var(--accent-primary);
}

/* ========== 占位符 ========== */
.multi-select-placeholder {
    color: var(--text-muted);
    font-size: 0.875rem;
    user-select: none;
}

/* ========== 选中标签 ========== */
.multi-select-tags {
    display: flex;
    flex-wrap: nowrap;
    gap: 0.25rem;
    align-items: center;
    overflow: hidden;
}

.multi-select-tag {
    background: var(--accent-primary);
    color: white;
    border-radius: calc(var(--radius) - 2px);
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    max-width: 200px;
    white-space: nowrap;
}

.multi-select-tag-text {
    overflow: hidden;
    text-overflow: ellipsis;
}

.multi-select-tag-remove {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    transition: all 0.15s ease;
    font-size: 12px;
}

.multi-select-tag-remove:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ========== 数量显示 ========== */
.multi-select-count {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: calc(var(--radius) - 2px);
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 500;
    white-space: nowrap;
}

/* ========== 下拉面板 ========== */
.multi-select-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    z-index: 1050;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    max-height: 320px;
    display: flex;
    flex-direction: column;
}

.multi-select-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* ========== 搜索区域 ========== */
.multi-select-search {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-light);
    background: var(--bg-secondary);
}

.multi-select-search-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.multi-select-search-input {
    width: 100%;
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 0.5rem 0.75rem 0.5rem 2.25rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.multi-select-search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgb(99 102 241 / 0.1);
}

.multi-select-search-input::placeholder {
    color: var(--text-muted);
}

.multi-select-search-icon {
    position: absolute;
    left: 0.75rem;
    color: var(--text-muted);
    font-size: 14px;
    pointer-events: none;
}

.multi-select-clear-btn {
    position: absolute;
    right: 0.5rem;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    font-size: 14px;
    transition: all 0.15s ease;
}

.multi-select-clear-btn:hover {
    background: var(--bg-tertiary);
    color: var(--danger);
}

/* ========== 选项列表 ========== */
.multi-select-list {
    flex: 1;
    overflow-y: auto;
    max-height: 240px;
    padding: 0.5rem 0;
    display: grid;
    grid-template-columns: repeat(var(--columns, 1), 1fr);
    gap: 0;
}

/* 自定义滚动条 */
.multi-select-list::-webkit-scrollbar {
    width: 6px;
}

.multi-select-list::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

.multi-select-list::-webkit-scrollbar-thumb {
    background: var(--border-medium);
    border-radius: 3px;
}

.multi-select-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ========== 选项项目 ========== */
.multi-select-item {
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    transition: all 0.15s ease;
    border-bottom: 1px solid transparent;
    max-width: 375px;
}


.multi-select-item:hover {
    background: var(--bg-tertiary);
}

.multi-select-item.selected {
    background: rgba(99, 102, 241, 0.1);
    border-bottom-color: var(--accent-primary);
}

.multi-select-item.selected:hover {
    background: rgba(99, 102, 241, 0.15);
}

.multi-select-item-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.4;
}

.multi-select-checkbox {
    width: 16px;
    height: 16px;
    accent-color: var(--accent-primary);
    cursor: pointer;
    margin: 0;
}

.multi-select-item-text {
    flex: 1;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.multi-select-item.selected .multi-select-item-text {
    color: var(--accent-primary);
    font-weight: 500;
}

/* ========== 禁用状态 ========== */
.multi-select-wrapper.disabled .multi-select-display {
    background: var(--bg-tertiary);
    cursor: not-allowed;
    opacity: 0.6;
}

.multi-select-wrapper.disabled .multi-select-placeholder,
.multi-select-wrapper.disabled .multi-select-tag,
.multi-select-wrapper.disabled .multi-select-count {
    opacity: 0.7;
}

/* ========== 错误状态 ========== */
.multi-select-wrapper.error .multi-select-display {
    border-color: var(--danger);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.multi-select-wrapper.error .multi-select-display:focus {
    border-color: var(--danger);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

/* ========== 成功状态 ========== */
.multi-select-wrapper.success .multi-select-display {
    border-color: var(--success);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

/* ========== 深色主题适配 ========== */
[data-theme="dark"] .multi-select-display {
    background: var(--bg-secondary);
    border-color: var(--border-light);
    color: var(--text-primary);
}

[data-theme="dark"] .multi-select-dropdown {
    background: var(--bg-primary);
    border-color: var(--border-light);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .multi-select-search {
    background: var(--bg-secondary);
    border-bottom-color: var(--border-light);
}

[data-theme="dark"] .multi-select-search-input {
    background: var(--bg-tertiary);
    border-color: var(--border-light);
    color: var(--text-primary);
}

[data-theme="dark"] .multi-select-search-input::placeholder {
    color: var(--text-muted);
}

[data-theme="dark"] .multi-select-item:hover {
    background: var(--bg-tertiary);
}

[data-theme="dark"] .multi-select-item.selected {
    background: rgba(129, 140, 248, 0.1);
}

[data-theme="dark"] .multi-select-item.selected:hover {
    background: rgba(129, 140, 248, 0.15);
}

/* ========== 响应式设计 ========== */
@media (max-width: 768px) {
    .multi-select-dropdown {
        max-height: 280px;
    }
    
    .multi-select-list {
        max-height: 200px;
        grid-template-columns: 1fr;
    }
    .multi-select-item {
        /* show 100% width for small screen */
        max-width: 100%;
    } 
    
    .multi-select-item-label {
        font-size: 0.9rem;
    }
    
    .multi-select-tag {
        font-size: 0.7rem;
        max-width: 100px;
    }
    
    .multi-select-search-input {
        font-size: 16px; /* 防止iOS缩放 */
    }
}

@media (max-width: 576px) {
    .multi-select-display {
        padding: 0.625rem 0.875rem;
    }
    
    .multi-select-dropdown {
        left: -0.5rem;
        right: -0.5rem;
        max-height: 260px;
    }
    
    .multi-select-list {
        max-height: 180px;
    }
    
    .multi-select-tag {
        font-size: 0.65rem;
        max-width: 80px;
    }
    
    .multi-select-count {
        font-size: 0.7rem;
    }
}

/* ========== 主题变量接口 ========== */
/* 
  可通过CSS变量自定义主题颜色：
  --multiselect-primary-color: 主色调
  --multiselect-bg-color: 背景颜色
  --multiselect-border-color: 边框颜色
  --multiselect-text-color: 文字颜色
  --multiselect-hover-bg: 悬停背景
*/

.multi-select-wrapper.custom-theme .multi-select-display {
    background: var(--multiselect-bg-color, var(--bg-primary));
    border-color: var(--multiselect-border-color, var(--border-light));
    color: var(--multiselect-text-color, var(--text-primary));
}

.multi-select-wrapper.custom-theme .multi-select-display:hover,
.multi-select-wrapper.custom-theme .multi-select-display:focus {
    border-color: var(--multiselect-primary-color, var(--accent-primary));
}

.multi-select-wrapper.custom-theme .multi-select-tag {
    background: var(--multiselect-primary-color, var(--accent-primary));
}

.multi-select-wrapper.custom-theme .multi-select-item:hover {
    background: var(--multiselect-hover-bg, var(--bg-tertiary));
}

.multi-select-wrapper.custom-theme .multi-select-item.selected {
    background: var(--multiselect-primary-color, rgba(99, 102, 241, 0.1));
    border-bottom-color: var(--multiselect-primary-color, var(--accent-primary));
}

/* ========== 动画效果 ========== */
.multi-select-tag {
    animation: tagSlideIn 0.2s ease;
}

@keyframes tagSlideIn {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.multi-select-item.selected .multi-select-checkbox {
    animation: checkboxCheck 0.2s ease;
}

@keyframes checkboxCheck {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

/* ========== 辅助功能支持 ========== */
.multi-select-display:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    .multi-select-dropdown,
    .multi-select-arrow,
    .multi-select-tag,
    .multi-select-item,
    * {
        transition: none !important;
        animation: none !important;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .multi-select-display {
        border-width: 2px;
    }
    
    .multi-select-item.selected {
        border-left: 3px solid var(--accent-primary);
    }
}