:root {
    --bg: #0c0e12;
    --surface: #141820;
    --surface-elevated: #1c2230;
    --border: #2a3344;
    --border-focus: #4a7fd4;
    --text: #e8ecf4;
    --text-secondary: #8b95a8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-muted: rgba(59, 130, 246, 0.12);
    --success: #22c55e;
    --radius: 8px;
    --font-mono: "Cascadia Code", "Consolas", "SF Mono", monospace;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
    min-height: 100dvh;
    padding env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.topbar-brand h1 {
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: 0.01em;
}

.topbar-brand p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-top: 0.125rem;
}

.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1rem;
    align-items: flex-end;
    padding: 1rem 1.5rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.filter-group label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.filter-search {
    flex: 1 1 240px;
    min-width: 200px;
}

.filter-row {
    display: contents;
}

.filter-actions {
    display: contents;
}

.btn-category-toggle {
    display: none;
}

.sidebar-backdrop {
    display: none;
}

.filter-group input,
.filter-group select {
    height: 36px;
    padding: 0 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface-elevated);
    color: var(--text);
    font-size: 0.875rem;
}

.filter-group input:focus,
.filter-group select:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-muted);
}

.btn {
    height: 36px;
    padding: 0 1rem;
    border: 1px solid transparent;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-secondary {
    background: var(--surface-elevated);
    border-color: var(--border);
    color: var(--text);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--border-focus);
}

.btn-secondary:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

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

.btn-ghost:hover {
    color: var(--text);
    border-color: var(--text-secondary);
}

.workspace {
    flex: 1;
    display: flex;
    min-height: 0;
}

.sidebar {
    width: 260px;
    flex-shrink: 0;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.875rem 1rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

.sidebar-total {
    font-weight: 400;
    font-size: 0.75rem;
}

.category-nav {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.category-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 0.5rem 0.625rem;
    margin-bottom: 2px;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.8125rem;
    text-align: left;
    cursor: pointer;
    transition: background 0.12s, color 0.12s;
}

.category-link:hover {
    background: var(--surface-elevated);
    color: var(--text);
}

.category-link.active {
    background: var(--accent-muted);
    color: var(--text);
    font-weight: 500;
}

.category-count {
    font-size: 0.6875rem;
    padding: 0.125rem 0.5rem;
    border-radius: 999px;
    background: var(--surface-elevated);
    color: var(--text-secondary);
}

.category-link.active .category-count {
    background: rgba(59, 130, 246, 0.2);
    color: var(--accent);
}

.main-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.panel-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.panel-toolbar-main {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 0;
    flex: 1;
}

.panel-toolbar-main .stats {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.panel-meta {
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

.table-wrapper {
    flex: 1;
    overflow: auto;
    padding: 0 1.25rem;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.data-table thead th {
    position: sticky;
    top: 0;
    z-index: 2;
    background: var(--bg);
    padding: 0.625rem 0.75rem;
    text-align: left;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-bottom: 1px solid var(--border);
}

.data-table tbody td {
    padding: 0.625rem 0.75rem;
    border-bottom: 1px solid rgba(42, 51, 68, 0.6);
    vertical-align: top;
}

.data-table tbody tr {
    cursor: pointer;
    transition: background 0.1s;
}

.data-table tbody tr:hover {
    background: var(--surface-elevated);
}

.data-table tbody tr.selected {
    background: var(--accent-muted);
}

.col-id {
    width: 120px;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--accent);
    white-space: nowrap;
}

.col-category {
    width: 160px;
}

.col-cn {
    font-weight: 500;
    word-break: break-word;
}

.col-en {
    color: var(--text-secondary);
    word-break: break-word;
}

.badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    border-radius: 4px;
    font-size: 0.6875rem;
    font-weight: 500;
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    white-space: nowrap;
}

.empty-cell {
    text-align: center;
    padding: 3rem 1rem !important;
    color: var(--text-secondary);
}

.loading-inline {
    padding: 1rem;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    padding: 0.875rem 1.25rem;
    border-top: 1px solid var(--border);
    background: var(--surface);
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.toast {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius);
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    font-size: 0.8125rem;
    z-index: 1000;
}

.toast.success {
    border-color: var(--success);
    color: var(--success);
}

/* 平板及以下 */
@media (max-width: 900px) {
    .topbar {
        padding: 0.875rem 1rem;
    }

    .topbar-brand p {
        display: none;
    }

    .filter-bar {
        padding: 0.875rem 1rem;
        gap: 0.625rem;
    }

    .filter-row {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.625rem;
        width: 100%;
    }

    .filter-actions {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.625rem;
        width: 100%;
    }

    .filter-actions .btn {
        width: 100%;
    }

    .filter-search {
        flex: 1 1 100%;
        min-width: 0;
        width: 100%;
    }

    .filter-group input,
    .filter-group select,
    .btn {
        height: 44px;
        font-size: 1rem;
    }

    .workspace {
        flex-direction: column;
        position: relative;
    }

    .btn-category-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
        white-space: nowrap;
    }

    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: min(88vw, 320px);
        max-height: none;
        z-index: 300;
        border-right: 1px solid var(--border);
        transform: translateX(-105%);
        transition: transform 0.25s ease;
        box-shadow: var(--shadow);
    }

    .sidebar.is-open {
        transform: translateX(0);
    }

    .sidebar-backdrop {
        display: block;
        position: fixed;
        inset: 0;
        z-index: 290;
        background: rgba(0, 0, 0, 0.55);
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.25s ease;
    }

    .sidebar-backdrop.is-visible {
        opacity: 1;
        pointer-events: auto;
    }

    .panel-toolbar {
        flex-direction: column;
        align-items: stretch;
        padding: 0.875rem 1rem 1rem;
        gap: 0.5rem;
    }

    .panel-toolbar-main .stats {
        white-space: normal;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
    }

    .panel-meta {
        text-align: right;
    }

    .table-wrapper {
        padding: 1rem 1rem 1.25rem;
        -webkit-overflow-scrolling: touch;
    }

    .data-table tbody tr:first-child {
        margin-top: 0.125rem;
    }

    .data-table thead {
        display: none;
    }

    .data-table tbody tr {
        display: block;
        margin-bottom: 0.75rem;
        padding: 0.75rem;
        border: 1px solid var(--border);
        border-radius: var(--radius);
        background: var(--surface);
    }

    .data-table tbody tr:hover,
    .data-table tbody tr.selected {
        background: var(--surface-elevated);
    }

    .data-table tbody td {
        display: flex;
        align-items: flex-start;
        gap: 0.75rem;
        padding: 0.375rem 0;
        border-bottom: none;
    }

    .data-table tbody td::before {
        content: attr(data-label);
        flex: 0 0 4.5rem;
        font-size: 0.75rem;
        font-weight: 600;
        color: var(--text-secondary);
        text-transform: uppercase;
        letter-spacing: 0.03em;
        padding-top: 0.125rem;
    }

    .data-table tbody td.col-id::before {
        content: "ID";
    }

    .data-table tbody td.col-category::before {
        content: "分类";
    }

    .data-table tbody td.col-cn::before {
        content: "中文";
    }

    .data-table tbody td.col-en::before {
        content: "英文";
    }

    .data-table tbody td.col-id,
    .data-table tbody td.col-category,
    .data-table tbody td.col-cn,
    .data-table tbody td.col-en {
        width: auto;
    }

    .data-table tbody td.col-id {
        font-size: 0.9375rem;
    }

    .empty-cell {
        display: block;
        border: none;
        background: transparent;
        padding: 2rem 0.5rem !important;
    }

    .empty-cell::before {
        display: none !important;
    }

    .pagination {
        padding: 0.875rem 1rem calc(0.875rem + env(safe-area-inset-bottom));
        gap: 0.75rem;
    }

    .pagination .btn {
        flex: 1;
        max-width: 140px;
    }

    .toast {
        bottom: calc(1rem + env(safe-area-inset-bottom));
        left: 1rem;
        right: 1rem;
        transform: none;
        text-align: center;
    }
}

/* 小屏手机 */
@media (max-width: 480px) {
    .topbar {
        flex-direction: column;
        align-items: stretch;
        gap: 0.625rem;
    }

    .topbar-actions .btn {
        width: 100%;
    }

    .filter-row {
        grid-template-columns: 1fr;
    }

    .category-link {
        min-height: 44px;
        padding: 0.625rem 0.75rem;
    }

    .sidebar-header {
        padding-top: calc(0.875rem + env(safe-area-inset-top));
    }
}