/* ================================================================
   box-model.css · 盒子模型 7 个子板块的样式
   ================================================================ */

/* ================================================================
   子板块切换
   ================================================================ */
.section-panel {
    display: none;
    animation: fadeIn 0.35s ease;
}
.section-panel.active { display: block; }

/* ================================================================
   统一演示场景
   ================================================================ */
.stage-unified {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    min-height: 480px;
}

.browser-frame {
    width: 100%;
    max-width: 640px;
    background: #1a2030;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--bg-tertiary);
}

.browser-bar {
    background: #2a3441;
    padding: 8px 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid #1a2030;
}

.browser-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}
.browser-dot.red { background: #ff5f57; }
.browser-dot.yellow { background: #febc2e; }
.browser-dot.green { background: #28c840; }

.browser-url {
    margin-left: 12px;
    background: #1a2030;
    color: var(--text-muted);
    padding: 3px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-family: var(--font-mono);
}

.browser-viewport {
    padding: 40px;
    background: #0f172a;
    min-height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image:
        linear-gradient(rgba(59, 130, 246, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.04) 1px, transparent 1px);
    background-size: 30px 30px;
}

/* ================================================================
   演示盒子：margin → border → padding → content
   ================================================================ */
.demo-box {
    background: rgba(236, 72, 153, 0.15);
    border: 1px dashed rgba(236, 72, 153, 0.5);
    border-radius: 8px;
    padding: 24px;
    position: relative;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-block;
}

.demo-box-margin-label {
    position: absolute;
    top: 4px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    font-weight: 700;
    color: var(--accent-pink);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.demo-box-border {
    background: rgba(245, 158, 11, 0.2);
    border: 4px solid var(--accent-orange);
    border-radius: 6px;
    padding: 4px;
    position: relative;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    min-width: 120px;
    min-height: 80px;
}

.demo-box-border-label {
    position: absolute;
    top: -18px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    font-weight: 700;
    color: var(--accent-orange);
    letter-spacing: 1px;
    text-transform: uppercase;
    background: var(--bg-primary);
    padding: 1px 6px;
    border-radius: 3px;
    white-space: nowrap;
}

.demo-box-padding {
    background: rgba(16, 185, 129, 0.2);
    border-radius: 4px;
    padding: 24px;
    position: relative;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.demo-box-padding-label {
    position: absolute;
    top: 4px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    font-weight: 700;
    color: var(--accent-green);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.demo-box-content {
    background: var(--content-color);
    border-radius: 3px;
    padding: 16px 24px;
    min-width: 80px;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 12px;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
}

/* ================================================================
   板块 2：div 对比
   ================================================================ */
.stage-compare {
    display: flex;
    gap: 20px;
    padding: 24px;
    min-height: 400px;
    align-items: flex-start;
}
.compare-col { flex: 1; display: flex; flex-direction: column; gap: 10px; }
.compare-col h4 {
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}
.layout-mock { display: flex; flex-direction: column; gap: 6px; flex: 1; }
.mock-block {
    background: var(--bg-tertiary);
    border: 1px dashed var(--accent-blue);
    border-radius: 6px;
    padding: 10px;
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--accent-cyan);
    text-align: center;
}
.mock-row { display: grid; grid-template-columns: 2fr 1fr; gap: 6px; }
.mock-article { background: rgba(59, 130, 246, 0.15); border-color: var(--accent-blue); text-align: left; }
.mock-sidebar { background: rgba(139, 92, 246, 0.15); border-color: var(--accent-purple); color: var(--accent-purple); }
.mock-inner {
    display: block;
    margin-top: 6px;
    padding: 6px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 4px;
    font-size: 9px;
}

/* ================================================================
   板块 3：边框
   ================================================================ */
.control-panel-wide {
    margin-top: 0;
    position: sticky;
    top: 88px;
    align-self: start;
}

.border-sub-panel { display: none; }
.border-sub-panel.active { display: block; }

.border-multi-slots {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.border-multi-slot {
    background: var(--bg-primary);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 12px 16px;
}

.border-multi-slot-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 600;
}

.border-multi-slot-header .slot-label {
    color: var(--accent-cyan);
}

.border-multi-slot-controls {
    display: flex;
    gap: 8px;
    align-items: center;
}

.border-multi-slot-controls select {
    flex: 1;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-sm);
    padding: 6px 10px;
    font-size: 12px;
    font-family: inherit;
}

.border-multi-slot-controls input[type="range"] { flex: 2; }
.border-multi-slot-controls input[type="color"] {
    width: 36px;
    height: 28px;
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-sm);
    background: none;
    cursor: pointer;
}

.per-side-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.per-side-item {
    background: var(--bg-primary);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.per-side-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-cyan);
}

.mini-select {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-sm);
    padding: 5px 8px;
    font-size: 11px;
    font-family: inherit;
}

.mini-range { width: 100%; }
.mini-color {
    width: 100%;
    height: 26px;
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-sm);
    background: none;
    cursor: pointer;
}
#borderSettingArea.is-disabled {
    opacity: 0.35;
    pointer-events: none;
    filter: grayscale(0.4);
    position: relative;
}
#borderSettingArea.is-disabled::after {
    content: 'border-style: none 时，以下设置不生效';
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(15, 23, 42, 0.6);
    color: var(--accent-orange);
    font-size: 12px;
    font-weight: 700;
    border-radius: var(--radius-md);
    pointer-events: none;
    z-index: 5;
}

/* ================================================================
   板块 4/5：padding / margin 滑块
   ================================================================ */
.padding-sliders {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.padding-slider-item {
    background: var(--bg-primary);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 10px 14px;
}

.padding-slider-item label {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.padding-slider-item .value-display {
    color: var(--accent-cyan);
    font-family: var(--font-mono);
    font-weight: 700;
}

/* ================================================================
   板块 5：margin 父元素 + 四方向相邻
   ================================================================ */
.stage-margin-demo {
    padding: 24px;
}

.margin-parent-viewport {
    padding: 30px 20px;
    min-height: 420px;
    display: block;
    position: relative;
}

.margin-parent {
    position: relative;
    background: rgba(15, 23, 42, 0.5);
    border: 2px dashed var(--accent-purple);
    border-radius: 8px;
    padding: 20px;
    min-height: 340px;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.margin-parent.no-auto {
    align-items: flex-start;
}

.margin-parent-label {
    position: absolute;
    top: -12px;
    left: 12px;
    background: var(--bg-primary);
    color: var(--accent-purple);
    font-size: 10px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 3px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.margin-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.margin-parent.no-auto .margin-row {
    justify-content: flex-start;
}

.margin-neighbor {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 8px 14px;
    font-size: 11px;
    border-radius: var(--radius-sm);
    border: 1px dashed var(--bg-elevated);
    white-space: nowrap;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.margin-parent.no-auto .margin-neighbor {
    align-self: flex-start;
}

.neighbor-left,
.neighbor-right {
    writing-mode: vertical-rl;
    padding: 14px 8px;
}

/* 粉红色 margin 层 */


.margin-layer-label {
    position: absolute;
    top: 4px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    font-weight: 700;
    color: var(--accent-pink);
    letter-spacing: 1px;
    text-transform: uppercase;
    pointer-events: none;
    opacity: 0.9;
    z-index: 2;
}

/* ================================================================
   margin 合并演示
   ================================================================ */
.stage-collapse-demo {
    min-height: 360px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px 20px;
}

.collapse-pair {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 360px;
    gap: 0;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.collapse-item {
    background: var(--content-color);
    color: white;
    padding: 16px 32px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    position: relative;
    z-index: 2;
    min-width: 220px;
    text-align: center;
    border: 2px solid var(--accent-cyan);
    transition: margin 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.collapse-item-label {
    font-size: 12px;
}

.collapse-item-margin {
    font-size: 10px;
    color: rgba(255, 255, 255, 0.7);
    font-family: var(--font-mono);
}

.collapse-gap-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(236, 72, 153, 0.15);
    border: 1px solid var(--accent-pink);
    border-radius: 20px;
    padding: 3px 12px;
    z-index: 3;
    pointer-events: none;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    margin: 0;
    height: 24px;
}

.collapse-gap-indicator .gap-line {
    width: 14px;
    height: 1px;
    background: var(--accent-pink);
}

.collapse-gap-indicator .gap-label {
    font-size: 11px;
    color: var(--accent-pink);
    font-weight: 600;
    font-family: var(--font-mono);
}

/* 环绕视口 */
.margin-surround-viewport {
    min-height: 460px;
    padding: 30px 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.margin-surround {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0;
    transition: all 0.4s ease;
}

.surround-middle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    transition: all 0.4s ease;
}

.surround-neighbor {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 10px 18px;
    font-size: 11px;
    border-radius: var(--radius-sm);
    border: 1px dashed var(--bg-elevated);
    white-space: nowrap;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    min-width: 80px;
}

.surround-left,
.surround-right {
    writing-mode: vertical-rl;
    padding: 18px 10px;
    min-height: 80px;
    min-width: 36px;
}

/* 盒子外层的粉色 margin 层：padding 就是视觉上的外边距宽度 */
.margin-demo-box-outer {
    display: inline-block;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.margin-demo-box-margin {
    background: rgba(236, 72, 153, 0.25);
    border: 1px dashed rgba(236, 72, 153, 0.6);
    border-radius: 6px;
    padding: 0;
    position: relative;
    transition: padding 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 四周邻居与盒子之间的间距，直接由邻居的 margin 实现 */
.surround-top    { margin-bottom: 0; }
.surround-bottom { margin-top: 0; }
.surround-left   { margin-right: 0; }
.surround-right  { margin-left: 0; }

/* 对齐演示视口 */
.align-viewport {
    min-height: 360px;
    padding: 24px;
    display: flex;
    position: relative;
    background-image:
        linear-gradient(rgba(59, 130, 246, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.06) 1px, transparent 1px);
    background-size: 30px 30px;
    transition: all 0.4s ease;
}

.align-box {
    width: 120px;
    height: 80px;
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 13px;
    transition: margin 0.4s ease;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
    flex-shrink: 0;
}

.align-box-content {
    pointer-events: none;
}

/* ================================================================
   板块 6：宽高演示
   ================================================================ */
.size-viewport {
    min-height: 460px;
    padding: 50px 40px;
    align-items: center;
    justify-content: center;
    display: flex;
}

/* 粉色虚线框：模拟 margin 区域 */
.size-margin-layer {
    position: relative;
    background: rgba(236, 72, 153, 0.12);
    border: 1px dashed rgba(236, 72, 153, 0.6);
    border-radius: 8px;
    padding: 0;  /* 由 JS 动态设置为 margin 值 */
    transition: padding 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-block;
}

.size-margin-label {
    position: absolute;
    top: 4px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    font-weight: 700;
    color: var(--accent-pink);
    letter-spacing: 1px;
    text-transform: uppercase;
    pointer-events: none;
    opacity: 0.9;
}

.size-demo-box {
    box-sizing: content-box;
    width: 200px;
    height: 100px;
    padding: 20px;
    border: 5px solid var(--accent-orange);
    background: rgba(16, 185, 129, 0.2);
    position: relative;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: stretch;
    justify-content: stretch;
    margin: 0;  /* 外边距由外层 .size-margin-layer 的 padding 表现 */
}

.size-demo-box::before {
    content: 'border + padding';
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    font-weight: 700;
    color: var(--accent-orange);
    letter-spacing: 1px;
    text-transform: uppercase;
    background: var(--bg-primary);
    padding: 1px 6px;
    border-radius: 3px;
    white-space: nowrap;
    z-index: 5;
}

.size-demo-box .demo-box-content,
#sizeDemoContent {
    background: var(--content-color);
    border-radius: 3px;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 11px;
    text-align: center;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    flex: 1;
    box-sizing: border-box;
    min-width: 0;
    min-height: 0;
    overflow: hidden;
}

/* 计算面板总宽高行高亮 */
.calc-row-total {
    border-top: 1px dashed var(--bg-tertiary);
    margin-top: 6px;
    padding-top: 8px;
}

/* ================================================================
   板块 7：背景演示
   ================================================================ */
.stage-scrollable {
    padding: 0;
    min-height: auto;
}

.scroll-viewport {
    height: 520px;
    overflow-y: auto;
    padding: 30px 40px;
    display: block;
    scrollbar-width: thin;
    scrollbar-color: var(--bg-tertiary) transparent;
    position: relative;
}

.scroll-viewport::-webkit-scrollbar { width: 8px; }
.scroll-viewport::-webkit-scrollbar-thumb { background: var(--bg-tertiary); border-radius: 4px; }

.bg-scroll-content {
    min-height: 950px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 40px;
}

.bg-demo-box {
    position: relative;
    padding: 20px;
    background: rgba(236, 72, 153, 0.1);
    border: 1px dashed rgba(236, 72, 153, 0.5);
    border-radius: 8px;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-block;
}

.bg-demo-box::before {
    content: 'margin';
    position: absolute;
    top: 4px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    font-weight: 700;
    color: var(--accent-pink);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.bg-demo-border {
    background: rgba(245, 158, 11, 0.35);
    border: 4px solid var(--accent-orange);
    padding: 4px;
    position: relative;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 4px;
}

.bg-demo-border::before {
    content: 'border（不覆盖）';
    position: absolute;
    top: -18px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    font-weight: 700;
    color: var(--accent-orange);
    letter-spacing: 0.5px;
    background: var(--bg-primary);
    padding: 1px 6px;
    border-radius: 3px;
    white-space: nowrap;
    z-index: 5;
}

.bg-demo-padding {
    background-color: #1e3a5f;
    background-repeat: no-repeat;
    background-position: center center;
    background-size: auto;
    background-attachment: scroll;
    background-origin: padding-box;
    background-clip: padding-box;

    padding: 12px;
    position: relative;
    min-width: 400px;
    min-height: 260px;
    border-radius: 3px;
    transition: background 0.4s ease;
    display: flex;
    align-items: stretch;
    justify-content: stretch;
    overflow: hidden;
}

.bg-demo-padding::before {
    content: 'padding';
    position: absolute;
    top: 4px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    font-weight: 700;
    color: var(--accent-green);
    letter-spacing: 1px;
    text-transform: uppercase;
    z-index: 4;
    pointer-events: none;
    background: rgba(0, 0, 0, 0.5);
    padding: 1px 6px;
    border-radius: 3px;
}

.bg-fixed-image-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
    background-repeat: no-repeat;
    background-position: center center;
    background-size: auto;
    background-color: transparent;
    border-radius: 3px;
    z-index: 1;
}

.bg-fixed-image-layer.active {
    opacity: 1;
}

.bg-demo-content {
    flex: 1;
    background: rgba(30, 58, 95, 0.4);
    color: white;
    font-weight: 600;
    font-size: 13px;
    padding: 20px;
    border-radius: 3px;
    border: 1px dashed rgba(255, 255, 255, 0.3);
    position: relative;
    z-index: 3;
    transition: all 0.4s ease;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.bg-demo-content::before {
    content: 'content';
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 9px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.7);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    background: rgba(0, 0, 0, 0.5);
    padding: 1px 5px;
    border-radius: 3px;
    white-space: nowrap;
}

.bg-scroll-spacer {
    padding: 80px 20px;
    color: var(--text-muted);
    font-size: 13px;
    text-align: center;
}

.text-input {
    width: 100%;
    padding: 8px 12px;
    background: var(--bg-primary);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 12px;
    transition: all var(--transition-base);
    margin-top: 6px;
}

.text-input:focus {
    outline: none;
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
}

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

/* ================================================================
   通用小组件
   ================================================================ */
.preset-btns-wrap {
    flex-wrap: wrap;
}

.color-swatches {
    display: flex;
    gap: 6px;
    margin-top: 6px;
    flex-wrap: wrap;
}

.color-swatch {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
}

.color-swatch:hover { transform: scale(1.08); }
.color-swatch.active {
    border-color: var(--text-primary);
    box-shadow: 0 0 0 2px var(--bg-primary), 0 0 0 4px var(--accent-cyan);
}

.mini-table-wrapper {
    margin-top: 12px;
    overflow-x: auto;
}

.mini-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
    margin-top: 12px;
}

.mini-table td,
.mini-table th {
    padding: 8px 10px;
    border-bottom: 1px solid var(--bg-tertiary);
    text-align: left;
    color: var(--text-secondary);
}

.mini-table th {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.mini-table code {
    font-size: 10px;
    padding: 1px 4px;
}

/* ================================================================
   响应式
   ================================================================ */
@media (max-width: 1024px) {
    .stage-compare { flex-direction: column; }
    .per-side-grid { grid-template-columns: 1fr; }
    .margin-parent-viewport { padding: 20px 10px; }
    .control-panel-wide { position: static; }
}

@media (max-width: 640px) {
    .browser-viewport { padding: 20px; }
    .demo-box { padding: 14px; }
    .demo-box-padding { padding: 14px; }
    .margin-row { flex-direction: column; gap: 8px; }
    .neighbor-left, .neighbor-right { writing-mode: horizontal-tb; }
}