/* ==========================================
   DevToolBox - Style System v2.1
   Unified design tokens + compact layout
   + Global font scale system
   + Google-color top-4 button borders
   ========================================== */

/* --- 1. Design Tokens --- */
:root {
    /* Colors - Dark theme (default) */
    --bg-primary: #1e1e2e;
    --bg-secondary: #2d2d3f;
    --bg-tertiary: #363649;
    --bg-elevated: #313244;
    --text-primary: #cdd6f4;
    --text-secondary: #a6adc8;
    --text-muted: #6c7086;
    --accent: #89b4fa;
    --accent-hover: #74c7ec;
    --accent-soft: rgba(137, 180, 250, 0.12);
    --success: #a6e3a1;
    --warning: #f9e2af;
    --error: #f38ba8;
    --border: #45475a;
    --border-light: #3b3d52;
    --shadow: rgba(0, 0, 0, 0.3);
    --line-number-bg: #252535;
    --line-number-color: #585b70;

    /* Google logo colors for top-4 buttons */
    --google-red: #ea4335;
    --google-blue: #4285f4;
    --google-yellow: #fbbc04;
    --google-green: #34a853;

    /* Spacing scale */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 24px;

    /* Radius scale */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;

    /* Shadow scale */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.16);

    /* Transitions */
    --t-fast: 0.15s ease;
    --t-normal: 0.2s ease;
    --t-slow: 0.3s ease;

    /* Global font scale (1.0 = medium default) */
    --font-scale: 1;

    /* Font size scale (all derive from --font-scale) */
    --fs-xs:  calc(10px * var(--font-scale));
    --fs-sm:  calc(11px * var(--font-scale));
    --fs-md:  calc(12px * var(--font-scale));
    --fs-lg:  calc(13px * var(--font-scale));
    --fs-xl:  calc(14px * var(--font-scale));
    --fs-2xl: calc(15px * var(--font-scale));
    --fs-3xl: calc(16px * var(--font-scale));
    --fs-4xl: calc(18px * var(--font-scale));
    --fs-5xl: calc(24px * var(--font-scale));
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f7;
    --bg-tertiary: #e8e8ed;
    --bg-elevated: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #424245;
    --text-muted: #86868b;
    --accent: #007aff;
    --accent-hover: #0066cc;
    --accent-soft: rgba(0, 122, 255, 0.08);
    --success: #34c759;
    --warning: #ff9500;
    --error: #ff3b30;
    --border: #d2d2d7;
    --border-light: #e2e2e7;
    --shadow: rgba(0, 0, 0, 0.1);
    --line-number-bg: #f0f0f5;
    --line-number-color: #86868b;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.08);
}

/* --- 2. Reset & Base --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    width: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: var(--fs-xl);
    line-height: 1.5;
    overflow: hidden;
}

/* --- 3. App Layout --- */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

/* --- 4. Toolbar --- */
.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    gap: var(--space-md);
    flex-shrink: 0;
}

.logo {
    font-size: var(--fs-2xl);
    font-weight: 600;
    color: var(--accent);
    white-space: nowrap;
}

.toolbar-actions {
    display: flex;
    gap: var(--space-sm);
}

.action-btn {
    padding: 6px 14px;
    border: 1px solid var(--border);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--fs-md);
    transition: all var(--t-normal);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
}

.action-btn:hover {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    box-shadow: var(--shadow-sm);
}

/* --- 5. Function Area (卡片式布局) --- */
.function-area {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: var(--space-sm) var(--space-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.func-block {
    flex: 0 1 auto;
    min-width: 0;
    max-width: 480px;
    display: flex;
    align-items: stretch;
    border: 1.5px solid var(--google-blue);
    border-radius: 10px;
    background: var(--bg-primary);
    overflow: hidden;
    transition: box-shadow var(--t-normal), transform var(--t-normal);
}

.func-block:hover {
    box-shadow: 0 2px 12px rgba(66, 133, 244, 0.15);
    transform: translateY(-1px);
}

.func-block-info {
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: 8px 8px;
    min-width: 52px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
}

.func-block-logo {
    font-size: 22px;
    line-height: 1;
}

.func-block-desc {
    font-size: var(--fs-xs);
    color: var(--text-muted);
    font-weight: 600;
    white-space: nowrap;
    letter-spacing: 0.3px;
}

.func-block-btns {
    flex: 0 1 auto;
    display: grid;
    grid-template-columns: repeat(var(--btn-cols, 2), minmax(0, 1fr));
    gap: 6px;
    padding: 8px 10px;
    min-width: 0;
    align-content: start;
    justify-content: start;
}

.func-block-btns .func-btn {
    min-width: 0;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* 1 列布局：按钮按内容自然宽度左对齐，避免单按钮过宽 */
.func-block-btns[style*="--btn-cols: 1"] .func-btn {
    width: auto;
    max-width: 220px;
    justify-self: start;
}

.func-block-btns .func-input,
.func-block-btns .func-input-full {
    grid-column: 1 / -1;
    margin: 0;
    width: 100%;
}

.func-input {
    padding: 3px var(--space-sm);
    border: 1px solid var(--border);
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    font-size: var(--fs-sm);
    outline: none;
}

.func-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-soft);
}

.func-input::placeholder {
    color: var(--text-muted);
}

/* --- 6. Main Content & Splitter --- */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
    min-height: 0;
}

.full-page-main {
    padding: 0;
}

.splitter {
    width: 5px;
    background: var(--border);
    cursor: col-resize;
    flex-shrink: 0;
    position: relative;
    transition: background var(--t-normal);
    z-index: 5;
}

.splitter::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 3px;
    height: 32px;
    background: var(--text-muted);
    border-radius: var(--radius-sm);
    opacity: 0.4;
    transition: all var(--t-normal);
}

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

.splitter:hover::after {
    opacity: 1;
    background: white;
}

.splitter.dragging {
    background: var(--accent);
}

.splitter.dragging::after {
    opacity: 1;
    background: white;
    height: 48px;
}

/* --- 7. Panels --- */
.panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow: hidden;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.panel-title {
    font-weight: 500;
    font-size: var(--fs-lg);
}

.panel-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.panel-btn {
    padding: 3px var(--space-sm);
    border: 1px solid var(--border);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: var(--fs-sm);
    transition: all var(--t-normal);
}

.panel-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-soft);
}

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

.char-count, .status {
    font-size: var(--fs-sm);
    color: var(--text-muted);
}

.status.success {
    color: var(--success);
}

.status.error {
    color: var(--error);
}

/* --- 8. Code Areas & Line Numbers --- */
.code-area-wrapper {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
    min-height: 0;
}

.line-numbers {
    background: var(--line-number-bg);
    color: var(--line-number-color);
    padding: var(--space-lg) var(--space-sm) var(--space-lg) var(--space-md);
    text-align: right;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-size: var(--fs-lg);
    line-height: 1.6;
    user-select: none;
    overflow: hidden;
    min-width: 46px;
    white-space: pre;
    flex-shrink: 0;
}

.code-area {
    flex: 1;
    width: 100%;
    padding: var(--space-lg);
    border: none;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-size: var(--fs-lg);
    line-height: 1.6;
    resize: none;
    outline: none;
    tab-size: 2;
    overflow: auto;
}

.code-area-with-lines {
    padding-left: var(--space-sm);
}

.output-pre {
    margin: 0;
    padding: var(--space-lg) var(--space-lg) var(--space-lg) var(--space-sm);
    white-space: pre;
    overflow: auto;
}

#output-code {
    display: block;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-size: var(--fs-lg);
    line-height: 1.6;
    white-space: pre;
}

/* --- 9. Buttons --- */
.func-btn {
    padding: 3px 10px;
    border: 1px solid var(--border);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: var(--fs-md);
    transition: all var(--t-normal);
    white-space: nowrap;
    position: relative;
}

.func-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-soft);
}

.func-btn:active {
    transform: scale(0.95);
}

/* Top-4 frequent buttons: Google logo color borders */
.func-btn.top-1 {
    border: 2px solid var(--google-red);
    padding: 2px 9px;
}
.func-btn.top-1:hover {
    border-color: var(--google-red);
    color: var(--google-red);
    background: rgba(234, 67, 53, 0.12);
}

.func-btn.top-2 {
    border: 2px solid var(--google-blue);
    padding: 2px 9px;
}
.func-btn.top-2:hover {
    border-color: var(--google-blue);
    color: var(--google-blue);
    background: rgba(66, 133, 244, 0.12);
}

.func-btn.top-3 {
    border: 2px solid var(--google-yellow);
    padding: 2px 9px;
}
.func-btn.top-3:hover {
    border-color: var(--google-yellow);
    color: var(--google-yellow);
    background: rgba(251, 188, 4, 0.12);
}

.func-btn.top-4 {
    border: 2px solid var(--google-green);
    padding: 2px 9px;
}
.func-btn.top-4:hover {
    border-color: var(--google-green);
    color: var(--google-green);
    background: rgba(52, 168, 83, 0.12);
}

/* Active state (last clicked) */
.func-btn.active {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
}

/* Keep primary/danger for storage drawer context */
.func-btn.primary {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    font-weight: 500;
}

.func-btn.primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    color: white;
    box-shadow: var(--shadow-sm);
}

.func-btn.danger {
    border-color: var(--error);
    color: var(--error);
}

.func-btn.danger:hover {
    background: var(--error);
    color: white;
}

/* Generic btn (modal) */
.btn {
    padding: 6px 16px;
    border: 1px solid var(--border);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--fs-lg);
    transition: all var(--t-normal);
}

.btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.btn.primary {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

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

.btn-group {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
}

/* --- 10. Syntax Highlighting --- */
.json-key { color: #89b4fa; }
.json-string { color: #a6e3a1; }
.json-number { color: #fab387; }
.json-boolean { color: #f38ba8; }
.json-null { color: #cba6f7; }
.json-bracket { color: var(--text-secondary); }

[data-theme="light"] .json-key { color: #0066cc; }
[data-theme="light"] .json-string { color: #248a37; }
[data-theme="light"] .json-number { color: #e67700; }
[data-theme="light"] .json-boolean { color: #d70015; }
[data-theme="light"] .json-null { color: #8e44ad; }

.sql-keyword { color: #89b4fa; font-weight: 500; }
.sql-string { color: #a6e3a1; }
.sql-comment { color: #6c7086; font-style: italic; }
.sql-number { color: #fab387; }
.sql-function { color: #f5c2e7; }

[data-theme="light"] .sql-keyword { color: #0066cc; font-weight: 500; }
[data-theme="light"] .sql-string { color: #248a37; }
[data-theme="light"] .sql-comment { color: #86868b; font-style: italic; }
[data-theme="light"] .sql-number { color: #e67700; }
[data-theme="light"] .sql-function { color: #ad1457; }

/* --- 11. Storage Drawer --- */
.storage-drawer {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    height: 100vh;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border);
    z-index: 1000;
    transition: right var(--t-slow);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
}

.storage-drawer.open {
    right: 0;
}

.drawer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--t-slow);
}

.drawer-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

.storage-drawer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border);
}

.storage-drawer-header h3 {
    font-size: var(--fs-2xl);
    font-weight: 600;
}

.close-btn {
    width: 28px;
    height: 28px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: 50%;
    font-size: calc(20px * var(--font-scale));
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    transition: all var(--t-normal);
}

.close-btn:hover {
    background: var(--error);
    color: white;
}

.storage-drawer-actions {
    display: flex;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border);
}

.storage-drawer-actions .func-btn {
    flex: 1;
    padding: 6px 14px;
    font-size: var(--fs-lg);
}

.storage-header {
    display: flex;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    align-items: center;
}

#storage-search {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--border);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    font-size: var(--fs-lg);
    outline: none;
}

#storage-search:focus {
    border-color: var(--accent);
}

.storage-count {
    font-size: var(--fs-md);
    color: var(--text-muted);
    white-space: nowrap;
}

.storage-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md);
}

.storage-item {
    padding: var(--space-md);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-sm);
    cursor: pointer;
    transition: all var(--t-normal);
}

.storage-item:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-sm);
}

.storage-item-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 6px;
}

.storage-item-summary {
    font-weight: 500;
    font-size: var(--fs-lg);
    color: var(--text-primary);
    flex: 1;
    margin-right: var(--space-sm);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.storage-item-time {
    font-size: var(--fs-sm);
    color: var(--text-muted);
    white-space: nowrap;
}

.storage-item-preview {
    font-size: var(--fs-md);
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-bottom: var(--space-sm);
}

.storage-item-actions {
    display: flex;
    gap: 6px;
}

.storage-item-actions button {
    padding: 3px var(--space-sm);
    font-size: var(--fs-sm);
    border: 1px solid var(--border);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--t-normal);
}

.storage-item-actions button:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.storage-item-actions button.delete:hover {
    border-color: var(--error);
    color: var(--error);
}

/* --- 12. Toast --- */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: var(--space-md) var(--space-xl);
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    font-size: var(--fs-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: all var(--t-slow);
    z-index: 2000;
    pointer-events: none;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    border-left: 3px solid var(--success);
}

.toast.error {
    border-left: 3px solid var(--error);
}

/* --- 13. Scrollbar --- */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* --- 14. Special Results --- */
.cron-result {
    padding: var(--space-md) 0;
}

.cron-result-item {
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    margin-bottom: 6px;
    font-family: 'SF Mono', Monaco, monospace;
    font-size: var(--fs-lg);
    cursor: pointer;
    transition: background var(--t-normal);
}

.cron-result-item:hover {
    background: var(--bg-tertiary);
}

.cron-next-label {
    color: var(--accent);
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

.timestamp-result {
    padding: var(--space-sm) 0;
}

.timestamp-row {
    display: flex;
    justify-content: space-between;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--border);
}

.timestamp-row:last-child {
    border-bottom: none;
}

.timestamp-label {
    color: var(--text-secondary);
}

.timestamp-value {
    font-family: 'SF Mono', Monaco, monospace;
    color: var(--accent);
    cursor: pointer;
}

.timestamp-value:hover {
    text-decoration: underline;
}

/* --- 15. Modal --- */
.rename-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1500;
    display: flex;
    align-items: center;
    justify-content: center;
}

.rename-modal-content {
    background: var(--bg-secondary);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    width: 400px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
}

.rename-modal-content h4 {
    margin: 0;
    font-size: var(--fs-3xl);
}

/* --- 16. Empty State --- */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: var(--space-lg);
    opacity: 0.5;
}

/* --- 17. Responsive --- */
@media (max-width: 900px) {
    body {
        overflow: auto;
    }

    .app-container {
        height: auto;
        min-height: 100vh;
    }

    .function-area {
        padding: var(--space-xs) var(--space-sm);
        gap: var(--space-xs);
    }

    .func-block {
        min-width: 0;
        max-width: 100%;
    }

    /* 窄屏时统一为 2 列，不再跟随 --btn-cols */
    .func-block-btns {
        grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    }

    .func-block-btns .func-input,
    .func-block-btns .func-input-full {
        grid-column: 1 / -1;
    }

    .func-btn {
        padding: 3px 8px;
        font-size: var(--fs-sm);
    }

    .func-input {
        font-size: var(--fs-xs);
    }

    .main-content {
        flex-direction: column;
        overflow: visible;
    }

    .panel {
        min-height: 280px;
    }

    .splitter {
        display: none;
    }

    .storage-drawer {
        width: 100%;
        right: -100%;
    }

    .logo {
        font-size: var(--fs-lg);
    }

    .action-btn {
        padding: 5px 10px;
        font-size: var(--fs-sm);
    }
}

/* --- 18. Font Size Setting (settings page) --- */
.font-scale-options {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-top: var(--space-sm);
}

.font-scale-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    cursor: pointer;
}

.font-scale-option input[type="radio"] {
    display: none;
}

.font-scale-option label {
    padding: 6px 14px;
    border: 1px solid var(--border);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-size: var(--fs-md);
    transition: all var(--t-normal);
    white-space: nowrap;
    cursor: pointer;
}

.font-scale-option input[type="radio"]:checked + label {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    font-weight: 500;
}

.font-scale-option label:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.font-scale-option input[type="radio"]:checked + label:hover {
    background: var(--accent-hover);
    color: white;
}

.font-scale-preview {
    margin-top: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: 'SF Mono', Monaco, monospace;
}

/* --- 19. Diff 模式样式 --- */

/* diff 统计栏 */
.diff-stats-wrapper {
    flex-shrink: 0;
    padding: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.diff-stats-bar {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: 4px var(--space-md);
    font-size: var(--fs-sm);
}

.diff-stats-type {
    font-weight: 600;
    color: var(--accent);
    padding: 2px 8px;
    background: var(--accent-soft);
    border-radius: var(--radius-sm);
}

.diff-stats-item {
    color: var(--text-secondary);
}

.diff-stats-add { color: var(--success); }
.diff-stats-del { color: var(--error); }
.diff-stats-eq  { color: var(--text-muted); }
.diff-stats-total { color: var(--text-secondary); margin-left: auto; }

/* 行级 diff — 每行一个 block */
.diff-line {
    display: block;
    padding: 0 4px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-all;
}

.diff-eq {
    color: var(--text-secondary);
}

.diff-del {
    background: rgba(243, 139, 168, 0.15);
    color: var(--error);
    border-left: 3px solid var(--error);
    padding-left: 6px;
}

.diff-add {
    background: rgba(166, 227, 161, 0.15);
    color: var(--success);
    border-left: 3px solid var(--success);
    padding-left: 6px;
}

.diff-placeholder {
    background: var(--bg-tertiary);
    opacity: 0.3;
    border-left: 3px solid var(--border);
}

[data-theme="light"] .diff-del {
    background: rgba(255, 59, 48, 0.1);
}

[data-theme="light"] .diff-add {
    background: rgba(52, 199, 89, 0.1);
}

/* 词/字符级 diff — 内联高亮 */
.diff-eq-inline {
    color: var(--text-secondary);
}

.diff-del-inline {
    background: rgba(243, 139, 168, 0.25);
    color: var(--error);
    border-radius: 2px;
    text-decoration: line-through;
    text-decoration-color: rgba(243, 139, 168, 0.5);
}

.diff-add-inline {
    background: rgba(166, 227, 161, 0.25);
    color: var(--success);
    border-radius: 2px;
}

[data-theme="light"] .diff-del-inline {
    background: rgba(255, 59, 48, 0.15);
}

[data-theme="light"] .diff-add-inline {
    background: rgba(52, 199, 89, 0.15);
}

.diff-empty {
    color: var(--text-muted);
    font-style: italic;
    padding: var(--space-lg);
    display: block;
    text-align: center;
}

/* 重新编辑按钮 */
#btn-diff-reset {
    border-color: var(--accent);
    color: var(--accent);
    font-weight: 500;
}

#btn-diff-reset:hover {
    background: var(--accent);
    color: white;
}

/* diff 模式下 panel 标题 */
.panel-title.diff-mode {
    color: var(--accent);
}