/* =========================================================
   DS · Components
   按钮 / 表单 / 卡片 / 工具栏 / 表格 / 分页 / 页签 / 徽章 /
   空状态 / 骨架 / 树 / 菜单 / 弹窗 / 抽屉 / Toast
   ========================================================= */

/* ---------------------------------------------------------
   Button
   --------------------------------------------------------- */
.ds-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--ds-btn-gap);
    height: var(--ds-btn-h);
    padding: 0 var(--ds-btn-px);
    border: 1px solid transparent;
    border-radius: var(--ds-btn-radius);
    background: transparent;
    color: var(--ds-text-primary);
    font-family: inherit;
    font-size: var(--ds-btn-font-size);
    font-weight: var(--ds-btn-font-weight);
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
    user-select: none;
    transition:
        background var(--ds-motion-fast) var(--ds-ease-standard),
        border-color var(--ds-motion-fast) var(--ds-ease-standard),
        color var(--ds-motion-fast) var(--ds-ease-standard),
        box-shadow var(--ds-motion-fast) var(--ds-ease-standard),
        transform var(--ds-motion-fast) var(--ds-ease-standard);
}

.ds-btn i {
    position: relative;
    top: 0.5px;
    font-size: 1em;
    line-height: 1;
}

.ds-btn:hover { background: var(--ds-btn-ghost-hover-bg); }

.ds-btn:active {
    transform: scale(0.96);
}

.ds-btn[disabled],
.ds-btn.is-disabled {
    opacity: var(--ds-btn-disabled-opacity);
    pointer-events: none;
}

.ds-btn.is-primary {
    background: var(--ds-btn-primary-bg);
    border-color: var(--ds-btn-primary-border);
    color: var(--ds-btn-primary-text);
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.18);
}

.ds-btn.is-primary:hover {
    background: var(--ds-btn-primary-hover-bg);
    border-color: var(--ds-btn-primary-hover-bg);
    color: var(--ds-btn-primary-text);
}

.ds-btn.is-primary:active {
    background: var(--ds-btn-primary-active-bg);
}

.ds-btn.is-secondary {
    background: var(--ds-btn-secondary-bg);
    border-color: var(--ds-btn-secondary-border);
    color: var(--ds-btn-secondary-text);
}

.ds-btn.is-secondary:hover {
    background: var(--ds-btn-secondary-hover-bg);
    border-color: var(--ds-btn-secondary-hover-border);
    color: var(--ds-btn-secondary-hover-text);
}

.ds-btn.is-ghost {
    background: transparent;
    border-color: transparent;
    color: var(--ds-btn-ghost-text);
}

.ds-btn.is-ghost:hover {
    background: var(--ds-btn-ghost-hover-bg);
    color: var(--ds-btn-ghost-hover-text);
}

.ds-btn.is-danger {
    background: var(--ds-btn-danger-bg);
    border-color: var(--ds-btn-danger-border);
    color: var(--ds-btn-danger-text);
}

.ds-btn.is-danger:hover {
    background: var(--ds-btn-danger-hover-bg);
    border-color: var(--ds-btn-danger-hover-border);
    color: var(--ds-btn-danger-text);
}

.ds-btn.is-danger-solid {
    background: var(--ds-color-brand-red);
    border-color: var(--ds-color-brand-red);
    color: var(--ds-btn-primary-text);
}

.ds-btn.is-success {
    background: var(--ds-color-surface);
    border-color: var(--color-success-border);
    color: var(--ds-btn-success-text);
}

.ds-btn.is-success:hover {
    background: var(--ds-color-success-soft);
    border-color: var(--ds-color-success);
}

.ds-btn.is-warning {
    background: var(--ds-color-surface);
    border-color: var(--color-warning-border);
    color: var(--ds-btn-warning-text);
}

.ds-btn.is-warning:hover {
    background: var(--ds-color-warning-soft);
    border-color: var(--ds-color-warning);
}

.ds-btn.is-sm {
    height: var(--ds-btn-h-sm);
    padding: 0 var(--ds-btn-px-sm);
    font-size: var(--ds-btn-font-size-sm);
}

.ds-btn.is-lg {
    height: var(--ds-btn-h-lg);
    padding: 0 var(--ds-btn-px-lg);
    font-size: var(--ds-btn-font-size-lg);
}

.ds-btn.is-icon {
    width: var(--ds-btn-h);
    padding: 0;
}

.ds-btn.is-icon.is-sm {
    width: var(--ds-btn-h-sm);
}

/* ---------------------------------------------------------
   Form
   --------------------------------------------------------- */
.ds-field {
    display: flex;
    flex-direction: column;
    gap: 5px;
    min-width: 0;
}

.ds-label {
    font-size: var(--ds-text-sm);
    font-weight: var(--ds-font-weight-medium);
    color: var(--ds-text-secondary);
}

.ds-label.is-required::after {
    content: '*';
    margin-left: 3px;
    color: var(--ds-color-danger);
}

.ds-input,
.ds-select,
.ds-textarea {
    width: 100%;
    height: var(--ds-control-h);
    min-height: var(--ds-control-h);
    padding: 0 10px;
    border: 1px solid var(--ds-control-border);
    border-radius: var(--ds-radius-xs);
    background: var(--ds-control-bg);
    color: var(--ds-text-primary);
    font-family: inherit;
    font-size: var(--ds-text-body-sm, 12.5px);
    outline: none;
    transition:
        border-color var(--ds-motion-fast) var(--ds-ease-standard),
        box-shadow var(--ds-motion-fast) var(--ds-ease-standard),
        background var(--ds-motion-fast) var(--ds-ease-standard);
}

.ds-textarea {
    height: auto;
    min-height: 88px;
    padding: 8px 10px;
    resize: vertical;
    line-height: var(--ds-leading-normal);
}

.ds-input:hover,
.ds-select:hover,
.ds-textarea:hover {
    border-color: var(--ds-control-border-hover);
}

.ds-input:focus,
.ds-select:focus,
.ds-textarea:focus {
    border-color: var(--ds-color-primary);
    box-shadow: var(--ds-focus-ring);
}

.ds-input::placeholder,
.ds-textarea::placeholder {
    color: var(--ds-control-placeholder);
}

.ds-input:disabled,
.ds-select:disabled,
.ds-textarea:disabled {
    background: var(--ds-control-disabled-bg);
    color: var(--ds-control-disabled-text);
    cursor: not-allowed;
}

.ds-input.is-invalid,
.ds-select.is-invalid,
.ds-textarea.is-invalid {
    border-color: var(--ds-color-danger);
}

.ds-input.is-invalid:focus,
.ds-select.is-invalid:focus,
.ds-textarea.is-invalid:focus {
    box-shadow: 0 0 0 3px var(--ds-color-danger-soft);
}

.ds-field__hint,
.ds-field__error {
    font-size: var(--ds-text-sm);
    line-height: var(--ds-leading-snug);
}

.ds-field__hint { color: var(--ds-text-tertiary); }
.ds-field__error { color: var(--ds-color-danger); }

.ds-select {
    padding-right: 30px;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23888' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    cursor: pointer;
}

.ds-input.is-sm,
.ds-select.is-sm {
    height: var(--ds-control-h-sm);
    min-height: var(--ds-control-h-sm);
    font-size: 12px;
}

.ds-search {
    position: relative;
    display: flex;
    align-items: center;
    min-width: 180px;
}

.ds-search > i {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--ds-color-text-tertiary);
    font-size: 13px;
    pointer-events: none;
}

.ds-search > .ds-input {
    padding-left: 31px;
}

.ds-check {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12.5px;
    color: var(--ds-color-text-secondary);
    cursor: pointer;
    user-select: none;
}

.ds-check input[type="checkbox"],
.ds-check input[type="radio"] {
    width: 16px;
    height: 16px;
    min-height: 0;
    margin: 0;
    accent-color: var(--ds-color-primary);
    cursor: pointer;
}

.ds-switch {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12.5px;
    color: var(--ds-color-text-secondary);
    cursor: pointer;
}

.ds-switch input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    min-height: 0;
}

.ds-switch__track {
    width: 36px;
    height: 22px;
    border-radius: var(--ds-radius-full);
    background: var(--color-border-strong);
    transition: background var(--ds-motion-fast) var(--ds-ease-standard);
    position: relative;
}

.ds-switch__track::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #fff;
    box-shadow: var(--ds-shadow-xs);
    transition: transform var(--ds-motion-base) var(--ds-ease-spring);
}

.ds-switch input:checked + .ds-switch__track {
    background: var(--ds-color-primary);
}

.ds-switch input:checked + .ds-switch__track::after {
    transform: translateX(14px);
}

.ds-switch input:focus-visible + .ds-switch__track {
    outline: 2px solid var(--ds-color-primary);
    outline-offset: 2px;
}

/* ---------------------------------------------------------
   Card
   --------------------------------------------------------- */
.ds-card {
    background: var(--ds-color-surface);
    border-radius: var(--ds-radius-lg);
    box-shadow: var(--ds-shadow-sm);
    overflow: hidden;
}

.ds-card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--ds-space-3);
    min-height: 48px;
    padding: 0 var(--ds-space-4);
    border-bottom: 1px solid var(--ds-color-border-light);
    font-size: var(--ds-text-md);
    font-weight: var(--ds-font-weight-semibold);
    color: var(--ds-text-primary);
}

.ds-card__body { padding: var(--ds-space-3); }

.ds-card__footer {
    padding: var(--ds-space-2) var(--ds-space-3);
    border-top: 1px solid var(--ds-color-border-light);
}

/* ---------------------------------------------------------
   Toolbar
   --------------------------------------------------------- */
.ds-toolbar {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--ds-space-2);
    min-height: 44px;
    padding: 5px 10px;
    border: 1px solid var(--ds-color-border);
    border-radius: var(--ds-radius-sm);
    background: var(--ds-color-surface);
}

.ds-toolbar__spacer { flex: 1 1 auto; }

.ds-toolbar__sep {
    width: 1px;
    height: 18px;
    background: var(--ds-color-border);
}

.ds-toolbar .ds-search {
    flex: 0 1 220px;
}

.ds-toolbar .ds-select {
    width: auto;
    min-width: 120px;
}

/* ---------------------------------------------------------
   Table
   --------------------------------------------------------- */
.ds-table-wrap {
    border: 1px solid var(--ds-color-border);
    border-radius: var(--ds-radius-sm);
    background: var(--ds-color-surface);
    overflow: auto;
}

.ds-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: var(--ds-table-font-size);
    color: var(--ds-text-primary);
}

.ds-table thead th {
    position: sticky;
    top: 0;
    z-index: var(--ds-z-sticky);
    height: var(--ds-table-head-h);
    padding: 0 var(--ds-table-cell-x);
    background: var(--ds-color-bg);
    color: var(--ds-table-head-color);
    font-size: var(--ds-table-head-font-size);
    font-weight: var(--ds-table-head-font-weight);
    text-align: left;
    white-space: nowrap;
    border-bottom: 1px solid var(--ds-color-border);
}

.ds-table tbody td {
    height: var(--ds-table-row-h);
    padding: 0 var(--ds-table-cell-x);
    border-bottom: 1px solid var(--ds-color-border-light);
    vertical-align: middle;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.ds-table tbody tr {
    transition: background var(--ds-motion-fast) var(--ds-ease-standard);
}

.ds-table tbody tr:hover { background: var(--ds-table-row-hover); }

.ds-table tbody tr.is-selected {
    background: var(--ds-table-selected-bg);
}

.ds-table tbody tr:last-child td { border-bottom: 0; }

.ds-table tbody tr.is-inactive td {
    color: var(--ds-color-text-tertiary);
}

.ds-table tbody tr.is-inactive .prt-name {
    text-decoration: line-through;
}

.ds-table .is-num {
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.ds-table .is-center { text-align: center; }

.ds-table .is-actions { text-align: right; }

.ds-table .is-muted { color: var(--ds-color-text-tertiary); }

.ds-table tbody td[colspan] {
    height: auto;
    padding: 40px 12px;
    text-align: center;
    color: var(--ds-color-text-tertiary);
}

.ds-table tbody td[colspan] .ds-empty {
    padding: 0;
}

.ds-table-wrap.is-compact tbody td { height: 36px; }
.ds-table-wrap.is-comfortable tbody td { height: 48px; }

/* ---------------------------------------------------------
   Pagination
   --------------------------------------------------------- */
.ds-pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--ds-space-2);
    flex-wrap: wrap;
    min-height: 40px;
    padding: 4px 10px;
    border-top: 1px solid var(--ds-color-border-light);
    font-size: var(--ds-text-sm);
    color: var(--ds-text-tertiary);
}

.ds-pagination__pages {
    display: flex;
    align-items: center;
    gap: 4px;
}

.ds-page-btn {
    min-width: 28px;
    height: 28px;
    padding: 0 8px;
    border: 1px solid var(--ds-color-border);
    border-radius: var(--ds-radius-xs);
    background: var(--ds-color-surface);
    color: var(--ds-text-secondary);
    font-family: inherit;
    font-size: var(--ds-text-sm);
    cursor: pointer;
    transition:
        background var(--ds-motion-fast) var(--ds-ease-standard),
        border-color var(--ds-motion-fast) var(--ds-ease-standard),
        color var(--ds-motion-fast) var(--ds-ease-standard),
        transform var(--ds-motion-fast) var(--ds-ease-standard);
}

.ds-page-btn:hover:not(:disabled) {
    border-color: var(--ds-color-primary);
    color: var(--ds-color-primary);
}

.ds-page-btn:active:not(:disabled) { transform: scale(0.94); }

.ds-page-btn.is-active {
    background: var(--ds-color-primary);
    border-color: var(--ds-color-primary);
    color: #fff;
}

.ds-page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ---------------------------------------------------------
   Tabs
   --------------------------------------------------------- */
.ds-tabs {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-wrap: wrap;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--ds-color-border-light);
}

.ds-tab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: var(--ds-control-h);
    padding: 0 14px;
    border: 1px solid transparent;
    border-radius: var(--ds-radius-sm);
    background: transparent;
    color: var(--ds-text-secondary);
    font-family: inherit;
    font-size: var(--ds-tab-font-size);
    font-weight: var(--ds-tab-font-weight);
    cursor: pointer;
    transition:
        background var(--ds-motion-fast) var(--ds-ease-standard),
        color var(--ds-motion-fast) var(--ds-ease-standard),
        border-color var(--ds-motion-fast) var(--ds-ease-standard);
}

.ds-tab:hover {
    background: var(--color-sidebar-hover);
    color: var(--ds-color-text);
}

.ds-tab.is-active {
    background: var(--ds-color-primary-soft);
    border-color: var(--color-primary-border);
    color: var(--ds-color-primary);
    font-weight: 600;
}

.ds-tab i { font-size: 13px; }

/* ---------------------------------------------------------
   Badge
   --------------------------------------------------------- */
.ds-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    height: 22px;
    padding: 0 8px;
    border-radius: var(--ds-radius-full);
    background: var(--color-sidebar-hover);
    color: var(--ds-text-secondary);
    font-size: var(--ds-badge-font-size);
    font-weight: var(--ds-badge-font-weight);
    white-space: nowrap;
}

.ds-badge.is-primary { background: var(--ds-color-primary-soft); color: var(--ds-color-primary); }
.ds-badge.is-success { background: var(--ds-color-success-soft); color: #15803d; }
.ds-badge.is-warning { background: var(--ds-color-warning-soft); color: #b45309; }
.ds-badge.is-danger { background: var(--ds-color-danger-soft); color: var(--ds-color-danger); }
.ds-badge.is-neutral { background: var(--color-sidebar-hover); color: var(--ds-color-text-secondary); }

[data-theme="dark"] .ds-badge.is-success { color: #4ade80; }
[data-theme="dark"] .ds-badge.is-warning { color: #fbbf24; }

/* ---------------------------------------------------------
   Empty / Skeleton
   --------------------------------------------------------- */
.ds-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: var(--ds-space-10) var(--ds-space-4);
    color: var(--ds-color-text-tertiary);
    text-align: center;
}

.ds-empty > i {
    font-size: 28px;
    opacity: 0.5;
}

.ds-empty__title {
    font-size: 13px;
    font-weight: 500;
    color: var(--ds-color-text-secondary);
}

.ds-empty__desc { font-size: 12px; }

.ds-skeleton {
    background: linear-gradient(90deg,
        var(--ds-color-border) 25%,
        transparent 50%,
        var(--ds-color-border) 75%);
    background-size: 200% 100%;
    border-radius: var(--ds-radius-xs);
    animation: ds-shimmer 1.6s ease-in-out infinite;
    pointer-events: none;
    user-select: none;
}

.ds-skeleton.is-text { height: 11px; }
.ds-skeleton.is-row { height: 16px; }

.ds-skeleton-table { padding: 6px 12px; }

.ds-skeleton-row {
    display: flex;
    align-items: center;
    gap: 12px;
    height: var(--ds-table-row-h);
    border-bottom: 1px solid var(--ds-color-border-light);
}

.ds-skeleton-row > span { flex: 1 1 0; }

@keyframes ds-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ---------------------------------------------------------
   Tree
   --------------------------------------------------------- */
.ds-tree {
    display: flex;
    flex-direction: column;
    gap: 1px;
    padding: var(--ds-space-1);
    overflow-y: auto;
}

.ds-tree__group + .ds-tree__group { margin-top: var(--ds-space-2); }

.ds-tree__title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
    padding: 6px 8px;
    font-size: var(--ds-text-sm);
    font-weight: var(--ds-font-weight-bold);
    color: var(--ds-text-secondary);
    letter-spacing: var(--ds-tracking-wide);
}

.ds-tree__node {
    display: flex;
    align-items: center;
    gap: 6px;
    width: 100%;
    min-height: 30px;
    padding: 5px 10px;
    border: 0;
    border-radius: var(--ds-radius-xs);
    background: transparent;
    color: var(--ds-text-secondary);
    font-family: inherit;
    font-size: var(--ds-text-body-sm);
    text-align: left;
    cursor: pointer;
    transition:
        background var(--ds-motion-fast) var(--ds-ease-standard),
        color var(--ds-motion-fast) var(--ds-ease-standard);
}

.ds-tree__node:hover {
    background: var(--color-sidebar-hover);
    color: var(--ds-color-text);
}

.ds-tree__node.is-active {
    background: var(--ds-color-primary-soft);
    color: var(--ds-color-primary);
    font-weight: 600;
}

.ds-tree__node.is-all {
    font-weight: 600;
    color: var(--ds-color-text);
}

.ds-tree__node.is-inactive {
    opacity: 0.6;
    text-decoration: line-through;
}

.ds-tree__node.is-depth-1 { padding-left: 22px; }
.ds-tree__node.is-depth-2 { padding-left: 34px; }
.ds-tree__node.is-depth-3 { padding-left: 46px; }

.ds-tree__caret {
    transition: transform var(--ds-motion-base) var(--ds-ease-standard);
}

/* 层级行（分类树、项目树）：支持缩进、连接信息与行内操作 */
.ds-tree--rows {
    padding: 4px;
}

.ds-tree-row {
    display: flex;
    align-items: center;
    gap: 6px;
    min-height: 36px;
    padding: 2px 6px;
    border-radius: var(--ds-radius-xs);
    transition: background var(--ds-motion-fast) var(--ds-ease-standard);
}

.ds-tree-row:hover { background: var(--color-sidebar-hover); }

.ds-tree-row.is-inactive { opacity: 0.62; }

.ds-tree-row__main {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1 1 auto;
    min-width: 0;
}

.ds-tree-row.is-depth-0 .ds-tree-row__main { padding-left: 0; }
.ds-tree-row.is-depth-1 .ds-tree-row__main { padding-left: 18px; }
.ds-tree-row.is-depth-2 .ds-tree-row__main { padding-left: 36px; }
.ds-tree-row.is-depth-3 .ds-tree-row__main { padding-left: 54px; }
.ds-tree-row.is-depth-4 .ds-tree-row__main { padding-left: 72px; }
.ds-tree-row.is-depth-5 .ds-tree-row__main { padding-left: 90px; }

.ds-tree-row__toggle {
    width: 22px;
    height: 22px;
    min-height: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 22px;
    padding: 0;
    border: 0;
    border-radius: var(--ds-radius-xs);
    background: transparent;
    color: var(--ds-color-text-tertiary);
    cursor: pointer;
}

.ds-tree-row__toggle:hover {
    background: var(--color-sidebar-hover);
    color: var(--ds-color-text);
}

.ds-tree-row__toggle-placeholder {
    width: 22px;
    flex: 0 0 22px;
}

.ds-tree-row__name {
    font-size: 13px;
    font-weight: 500;
    color: var(--ds-color-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ds-tree-row__code,
.ds-tree-row__meta {
    font-size: 11px;
    color: var(--ds-color-text-tertiary);
    white-space: nowrap;
}

.ds-tree-row__actions {
    display: flex;
    align-items: center;
    gap: 2px;
    opacity: 0;
    transition: opacity var(--ds-motion-fast) var(--ds-ease-standard);
}

.ds-tree-row:hover .ds-tree-row__actions,
.ds-tree-row:focus-within .ds-tree-row__actions {
    opacity: 1;
}

@media (hover: none) {
    .ds-tree-row__actions { opacity: 1; }
}

.ds-tree-row__actions .ds-btn {
    width: 24px;
    height: 24px;
    min-height: 24px;
    padding: 0;
}

.ds-summary {
    font-size: 12px;
    color: var(--ds-color-text-tertiary);
}

.ds-hint {
    margin: 0;
    padding: 6px 10px 0;
    font-size: 12px;
    color: var(--ds-color-text-tertiary);
}

.ds-tree__group.is-collapsed .ds-tree__caret {
    transform: rotate(-90deg);
}

.ds-tree__group.is-collapsed .ds-tree__items {
    display: none;
}

.ds-tree__items {
    animation: ds-collapse-in var(--ds-motion-base) var(--ds-ease-standard) both;
    transform-origin: top center;
}

.ds-tree__count {
    margin-left: auto;
    padding: 1px 6px;
    border-radius: var(--ds-radius-full);
    background: var(--color-sidebar-hover);
    color: var(--ds-color-text-tertiary);
    font-size: 10px;
    font-weight: 600;
}

.ds-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 4px;
}

/* ---------------------------------------------------------
   Menu / Dropdown
   --------------------------------------------------------- */
.ds-menu {
    min-width: 160px;
    padding: 4px;
    border: 1px solid var(--ds-color-border);
    border-radius: var(--ds-radius-md);
    background: var(--ds-color-surface-raised);
    box-shadow: var(--ds-shadow-lg);
    z-index: var(--ds-z-dropdown);
}

.ds-menu__item {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    min-height: 32px;
    padding: 6px 10px;
    border: 0;
    border-radius: var(--ds-radius-xs);
    background: transparent;
    color: var(--ds-text-secondary);
    font-family: inherit;
    font-size: var(--ds-text-body-sm);
    text-align: left;
    cursor: pointer;
    transition: background var(--ds-motion-fast) var(--ds-ease-standard), color var(--ds-motion-fast) var(--ds-ease-standard);
}

.ds-menu__item:hover {
    background: var(--color-sidebar-hover);
    color: var(--ds-color-text);
}

.ds-menu__item.is-danger { color: var(--ds-color-brand-red); }

.ds-menu__item.is-danger:hover {
    background: var(--ds-color-brand-red-soft);
}

.ds-menu__sep {
    height: 1px;
    margin: 4px 0;
    background: var(--ds-color-border-light);
}

/* ---------------------------------------------------------
   Feedback / Progress / Loading
   --------------------------------------------------------- */
@keyframes ds-spin {
    to { transform: rotate(360deg); }
}

.ds-spinner {
    display: inline-block;
    width: var(--ds-icon-md);
    height: var(--ds-icon-md);
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: ds-spin 700ms linear infinite;
    vertical-align: middle;
    flex: 0 0 auto;
}

.ds-spinner.is-sm { width: var(--ds-icon-xs); height: var(--ds-icon-xs); border-width: 1.5px; }
.ds-spinner.is-lg { width: var(--ds-icon-lg); height: var(--ds-icon-lg); }

.ds-btn.is-loading {
    pointer-events: none;
    opacity: 0.82;
}

.ds-btn.is-text {
    border-color: transparent;
    background: transparent;
    color: var(--ds-text-link);
    padding-left: 4px;
    padding-right: 4px;
}

.ds-btn.is-text:hover {
    background: var(--ds-color-primary-soft);
}

.ds-progress {
    width: 100%;
    height: 6px;
    border-radius: var(--ds-radius-full);
    background: var(--ds-color-border-light);
    overflow: hidden;
}

.ds-progress__bar {
    height: 100%;
    width: 0;
    border-radius: inherit;
    background: var(--ds-color-primary);
    transition: width var(--ds-motion-slow) var(--ds-ease-standard);
}

.ds-progress.is-success .ds-progress__bar { background: var(--ds-color-success); }
.ds-progress.is-warning .ds-progress__bar { background: var(--ds-color-warning); }
.ds-progress.is-danger .ds-progress__bar { background: var(--ds-color-danger); }

/* 原生 progress 元素 */
progress.ds-progress {
    appearance: none;
    -webkit-appearance: none;
    border: 0;
    height: 6px;
    background: var(--ds-color-border-light);
}

progress.ds-progress::-webkit-progress-bar {
    background: var(--ds-color-border-light);
    border-radius: var(--ds-radius-full);
}

progress.ds-progress::-webkit-progress-value {
    background: var(--ds-color-primary);
    border-radius: var(--ds-radius-full);
    transition: width var(--ds-motion-slow) var(--ds-ease-standard);
}

progress.ds-progress::-moz-progress-bar {
    background: var(--ds-color-primary);
    border-radius: var(--ds-radius-full);
}

progress.ds-progress.is-success::-webkit-progress-value,
progress.ds-progress.is-success::-moz-progress-bar { background: var(--ds-color-success); }

progress.ds-progress.is-warning::-webkit-progress-value,
progress.ds-progress.is-warning::-moz-progress-bar { background: var(--ds-color-warning); }

progress.ds-progress.is-danger::-webkit-progress-value,
progress.ds-progress.is-danger::-moz-progress-bar { background: var(--ds-color-danger); }

/* ---------------------------------------------------------
   Alert / Tooltip
   --------------------------------------------------------- */
.ds-alert {
    display: flex;
    align-items: flex-start;
    gap: var(--ds-space-2);
    padding: 10px 12px;
    border: 1px solid var(--ds-color-border);
    border-radius: var(--ds-radius-md);
    background: var(--ds-color-surface);
    color: var(--ds-text-primary);
    font-size: var(--ds-text-body-sm);
    line-height: var(--ds-leading-normal);
}

.ds-alert > i { margin-top: 1px; font-size: var(--ds-icon-md); }

.ds-alert.is-info { background: var(--ds-color-info-soft); border-color: var(--ds-color-info); }
.ds-alert.is-success { background: var(--ds-color-success-soft); border-color: var(--ds-color-success); }
.ds-alert.is-warning { background: var(--ds-color-warning-soft); border-color: var(--ds-color-warning); }
.ds-alert.is-danger { background: var(--ds-color-danger-soft); border-color: var(--ds-color-danger); }

.ds-tooltip {
    position: relative;
    display: inline-flex;
}

.ds-tooltip::after {
    content: attr(data-ds-tooltip);
    position: absolute;
    left: 50%;
    bottom: calc(100% + 6px);
    transform: translate(-50%, 4px);
    z-index: var(--ds-z-tooltip);
    padding: 5px 8px;
    border-radius: var(--ds-radius-xs);
    background: var(--color-tooltip-bg);
    color: var(--color-tooltip-text);
    font-size: var(--ds-text-xs);
    font-weight: var(--ds-font-weight-regular);
    line-height: var(--ds-leading-snug);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--ds-motion-fast) var(--ds-ease-standard), transform var(--ds-motion-fast) var(--ds-ease-standard);
}

.ds-tooltip:hover::after,
.ds-tooltip:focus-visible::after {
    opacity: 1;
    transform: translate(-50%, 0);
}

/* ---------------------------------------------------------
   Collapse / Breadcrumb / Steps
   --------------------------------------------------------- */
.ds-collapse {
    border: var(--ds-border-light);
    border-radius: var(--ds-radius-md);
    background: var(--ds-color-surface);
    overflow: hidden;
}

.ds-collapse__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--ds-space-2);
    width: 100%;
    min-height: 44px;
    padding: 0 var(--ds-space-3);
    border: 0;
    background: transparent;
    color: var(--ds-text-primary);
    font-family: inherit;
    font-size: var(--ds-text-body-sm);
    font-weight: var(--ds-font-weight-semibold);
    text-align: left;
    cursor: pointer;
}

.ds-collapse__header:hover { background: var(--ds-color-hover-bg); }

.ds-collapse__caret {
    transition: transform var(--ds-motion-base) var(--ds-ease-standard);
}

.ds-collapse.is-open .ds-collapse__caret { transform: rotate(180deg); }

.ds-collapse__body {
    display: none;
    padding: var(--ds-space-3);
    border-top: var(--ds-border-light);
}

.ds-collapse.is-open .ds-collapse__body {
    display: block;
    animation: ds-collapse-in var(--ds-motion-base) var(--ds-ease-standard) both;
}

.ds-breadcrumb {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
    font-size: var(--ds-text-caption, 12px);
    color: var(--ds-text-tertiary);
}

.ds-breadcrumb__item {
    color: var(--ds-text-secondary);
    text-decoration: none;
}

.ds-breadcrumb__item:hover { color: var(--ds-color-primary); }
.ds-breadcrumb__item.is-current { color: var(--ds-text-primary); font-weight: var(--ds-font-weight-medium); }
.ds-breadcrumb__sep { color: var(--ds-text-tertiary); }

.ds-steps {
    display: flex;
    align-items: center;
    gap: var(--ds-space-2);
    width: 100%;
}

.ds-step {
    display: flex;
    align-items: center;
    gap: var(--ds-space-2);
    flex: 1 1 0;
    min-width: 0;
}

.ds-step__dot {
    width: 24px;
    height: 24px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 24px;
    border: 1px solid var(--ds-color-border-strong);
    border-radius: 50%;
    background: var(--ds-color-surface);
    color: var(--ds-text-tertiary);
    font-size: var(--ds-text-xs);
    font-weight: var(--ds-font-weight-semibold);
}

.ds-step__label {
    font-size: var(--ds-text-caption, 12px);
    color: var(--ds-text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.ds-step__line {
    flex: 1 1 auto;
    height: 1px;
    background: var(--ds-color-border);
}

.ds-step.is-active .ds-step__dot {
    border-color: var(--ds-color-primary);
    background: var(--ds-color-primary);
    color: var(--ds-text-inverse);
}

.ds-step.is-active .ds-step__label { color: var(--ds-text-primary); font-weight: var(--ds-font-weight-semibold); }

.ds-step.is-done .ds-step__dot {
    border-color: var(--ds-color-success);
    background: var(--ds-color-success-soft);
    color: var(--ds-color-success);
}

/* ---------------------------------------------------------
   List / Form page
   --------------------------------------------------------- */
.ds-list {
    display: flex;
    flex-direction: column;
}

.ds-list__item {
    display: flex;
    align-items: flex-start;
    gap: var(--ds-space-3);
    padding: var(--ds-space-3);
    border-bottom: var(--ds-border-light);
}

.ds-list__item:last-child { border-bottom: 0; }
.ds-list__item:hover { background: var(--ds-color-hover-bg); }

.ds-list__main { flex: 1 1 auto; min-width: 0; }

.ds-list__title {
    font-size: var(--ds-text-body);
    font-weight: var(--ds-font-weight-medium);
    color: var(--ds-text-primary);
}

.ds-list__meta {
    margin-top: 2px;
    font-size: var(--ds-text-sm);
    color: var(--ds-text-tertiary);
}

.ds-list__actions {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 0 0 auto;
}

.ds-radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--ds-space-3);
}

.ds-form-page {
    display: flex;
    flex-direction: column;
    gap: var(--ds-form-gap);
    max-width: 960px;
    min-width: 0;
}

.ds-form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--ds-form-gap);
}

.ds-field.is-full { grid-column: 1 / -1; }

.ds-form-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--ds-space-2);
    padding-top: var(--ds-space-3);
    border-top: var(--ds-border-light);
}

.ds-card__footer.ds-form-actions {
    border-top: 0;
    padding-top: 0;
}

/* 最小点击热区（触屏/无障碍） */
.ds-hit {
    min-width: var(--ds-hit-min);
    min-height: var(--ds-hit-min);
}

@media (pointer: coarse) {
    .ds-btn,
    .ds-page-btn,
    .ds-tree__node,
    .ds-menu__item {
        min-height: var(--ds-hit-min);
    }

    .ds-btn.is-icon {
        width: var(--ds-hit-min);
    }
}