/* ============================================================
   帖子列表全局美化补丁 v2 — 2026-07-14
   针对8种布局逐一增强视觉效果
   ============================================================ */

/* ========== 通用：帖子项 hover 左侧彩色边条 ========== */
.bbs-topic-item {
    position: relative;
    transition: background 0.2s ease, box-shadow 0.2s ease;
}
.bbs-topic-item::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 0;
    background: var(--bbs-primary);
    border-radius: 0 2px 2px 0;
    transition: width 0.2s ease;
    z-index: 1;
}
.bbs-topic-item:hover::before { width: 3px; }
.bbs-topic-item:hover { background: color-mix(in srgb, var(--bbs-primary) 3%, var(--bbs-bg-card)); }
.bbs-topic-item.istop { background: var(--bbs-primary-bg); }
.bbs-topic-item.istop:hover { background: color-mix(in srgb, var(--bbs-primary) 6%, var(--bbs-bg-card)); }

/* ========== 通用：封面图 hover 缩放 ========== */
.bbs-topic-cover img,
.bbs-waterfall-cover img,
.bbs-bigcard-cover img {
    transition: transform 0.4s ease;
}
.bbs-topic-item:hover .bbs-topic-cover img,
.bbs-topic-waterfall:hover .bbs-waterfall-cover img {
    transform: scale(1.06);
}
.bbs-topic-cover {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

/* ========== 通用：标题 hover 渐变下划线 ========== */
.bbs-topic-title a,
.bbs-waterfall-title a,
.bbs-timeline-title a,
.bbs-compact-title a {
    position: relative;
    display: inline;
}
.bbs-topic-title a::after,
.bbs-waterfall-title a::after,
.bbs-timeline-title a::after {
    content: '';
    position: absolute;
    bottom: -1px; left: 0;
    width: 0; height: 1.5px;
    background: var(--bbs-primary);
    transition: width 0.3s ease;
}
.bbs-topic-title a:hover::after,
.bbs-waterfall-title a:hover::after,
.bbs-timeline-title a:hover::after {
    width: 100%;
}
.bbs-topic-title a:hover,
.bbs-waterfall-title a:hover,
.bbs-timeline-title a:hover,
.bbs-compact-title a:hover {
    text-decoration: none;
}

/* ========== 通用：分类标签更精致 ========== */
.cate-badge-sm {
    background: linear-gradient(135deg, var(--bbs-primary-bg), transparent);
    border: 1px solid color-mix(in srgb, var(--bbs-primary) 20%, transparent);
    font-weight: 600;
    letter-spacing: 0.2px;
}
.cate-badge {
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255,255,255,0.15);
}

/* ========== 通用：统计数字 hover 高亮 ========== */
.bbs-topic-views,
.bbs-topic-comments,
.bbs-waterfall-views,
.bbs-waterfall-comments,
.bbs-timeline-action,
.bbs-compact-views,
.bbs-compact-comments {
    transition: color 0.2s ease;
}
.bbs-topic-item:hover .bbs-topic-views,
.bbs-topic-item:hover .bbs-topic-comments {
    color: var(--bbs-text-sec);
}

/* ========== 卡片布局 (.bbs-layout-card) ========== */
.bbs-layout-card .bbs-topic-item {
    margin: 0 0 8px;
    border-radius: 10px;
    border: 1px solid var(--bbs-border-light);
    padding: 18px 20px;
}
.bbs-layout-card .bbs-topic-item:hover {
    border-color: color-mix(in srgb, var(--bbs-primary) 25%, var(--bbs-border));
    box-shadow: 0 4px 16px rgba(0,0,0,0.05);
}
.bbs-layout-card .bbs-topic-cover {
    width: 150px; height: 100px;
    border-radius: 8px;
    flex-shrink: 0;
}

/* ========== 列表布局 (.bbs-layout-list) ========== */
.bbs-layout-list .bbs-topic-item {
    padding: 14px 20px;
    border-bottom: 1px solid var(--bbs-border-light);
}
.bbs-layout-list .bbs-topic-item:last-child { border-bottom: none; }
.bbs-layout-list .bbs-topic-title a { font-size: 15px; }

/* ========== 表格布局 (.bbs-layout-table) ========== */
.bbs-layout-table {
    border-radius: 10px;
    border: 1px solid var(--bbs-border);
    overflow: hidden;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}
.bbs-layout-table .bbs-topic-item {
    padding: 10px 16px;
    min-height: 46px;
    border-bottom: 1px solid var(--bbs-border-light);
}
.bbs-layout-table .bbs-topic-item:nth-child(even) {
    background: color-mix(in srgb, var(--bbs-bg-hover) 50%, transparent);
}
.bbs-layout-table .bbs-topic-item:hover {
    background: color-mix(in srgb, var(--bbs-primary) 4%, var(--bbs-bg-card));
}
.bbs-layout-table .bbs-topic-item::before { display: none; }
.bbs-layout-table .bbs-topic-cover {
    width: 42px; height: 32px;
    border-radius: 5px;
}
.bbs-layout-table .bbs-topic-title {
    font-size: 13px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.bbs-layout-table .bbs-topic-time {
    font-variant-numeric: tabular-nums;
}

/* ========== 大图卡片 (.bbs-layout-hero-card) ========== */
.bbs-topic-bigcard {
    border-radius: 14px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    transition: transform 0.35s ease, box-shadow 0.35s ease;
}
.bbs-topic-bigcard:hover {
    transform: translateY(-6px) scale(1.01);
    box-shadow: 0 12px 32px rgba(0,0,0,0.15);
}
.bbs-bigcard-overlay {
    padding: 28px 18px;
    background: linear-gradient(0deg, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.3) 50%, transparent 100%);
    border-radius: 0 0 14px 14px;
}
.bbs-bigcard-title {
    text-shadow: 0 2px 6px rgba(0,0,0,0.5);
    letter-spacing: -0.2px;
}
.bbs-bigcard-meta {
    backdrop-filter: blur(4px);
    background: rgba(255,255,255,0.08);
    border-radius: 6px;
    padding: 4px 8px;
    margin-top: 8px;
}

/* ========== 瀑布流 (.bbs-layout-masonry) ========== */
.bbs-topic-waterfall {
    border-radius: 12px;
    border: 1px solid var(--bbs-border-light);
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.bbs-topic-waterfall:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    border-color: color-mix(in srgb, var(--bbs-primary) 20%, var(--bbs-border));
}
.bbs-waterfall-cover img {
    transition: transform 0.5s ease;
}
.bbs-topic-waterfall:hover .bbs-waterfall-cover img {
    transform: scale(1.08);
}
.bbs-waterfall-body {
    padding: 14px 16px;
}
.bbs-waterfall-excerpt {
    color: var(--bbs-text-sec);
    line-height: 1.6;
}
.bbs-waterfall-meta {
    border-top: 1px dashed var(--bbs-border-light);
    padding-top: 10px;
    margin-top: 10px;
}

/* ========== 时间线 (.bbs-layout-timeline) ========== */
.bbs-layout-timeline::before {
    background: linear-gradient(to bottom, var(--bbs-primary-bg), var(--bbs-border-light), var(--bbs-primary-bg));
    width: 2px;
}
.bbs-timeline-avatar img {
    border: 3px solid var(--bbs-bg-card);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.bbs-topic-timeline:hover .bbs-timeline-avatar img {
    transform: scale(1.08);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.bbs-timeline-content {
    border-radius: 12px;
    border: 1px solid var(--bbs-border-light);
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}
.bbs-topic-timeline:hover .bbs-timeline-content {
    box-shadow: 0 4px 16px rgba(0,0,0,0.06);
    border-color: color-mix(in srgb, var(--bbs-primary) 20%, var(--bbs-border));
}
.bbs-timeline-action {
    border-radius: 6px;
    transition: all 0.2s ease;
}
.bbs-timeline-action:hover {
    background: var(--bbs-primary-bg);
    color: var(--bbs-primary);
}

/* ========== 紧凑布局 (.bbs-layout-compact) ========== */
.bbs-layout-compact {
    border-radius: 10px;
    border: 1px solid var(--bbs-border);
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    overflow: hidden;
}
.bbs-topic-compact {
    height: 44px;
    padding: 0 16px;
    position: relative;
}
.bbs-topic-compact::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 0;
    background: var(--bbs-primary);
    transition: width 0.15s ease;
}
.bbs-topic-compact:hover::before { width: 2px; }
.bbs-topic-compact:nth-child(even) {
    background: color-mix(in srgb, var(--bbs-bg-hover) 40%, transparent);
}
.bbs-topic-compact:hover {
    background: color-mix(in srgb, var(--bbs-primary) 4%, var(--bbs-bg-card));
}
.bbs-compact-title a {
    transition: color 0.2s ease;
}
.bbs-compact-title a:hover {
    color: var(--bbs-primary);
    text-decoration: none;
}

/* ========== 分组布局 (.bbs-layout-grouped) ========== */
.bbs-group-panel {
    border-radius: 12px;
    border: 1px solid var(--bbs-border-light);
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    transition: box-shadow 0.2s ease;
}
.bbs-group-panel:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}
.bbs-group-header {
    background: linear-gradient(135deg, var(--bbs-bg-hover), var(--bbs-bg));
    font-weight: 700;
    letter-spacing: -0.2px;
}
.bbs-group-header:hover {
    background: color-mix(in srgb, var(--bbs-primary) 4%, var(--bbs-bg-hover));
}
.bbs-group-count {
    background: linear-gradient(135deg, var(--bbs-primary), var(--bbs-primary-dark));
    color: #fff;
    font-weight: 700;
    box-shadow: 0 2px 6px color-mix(in srgb, var(--bbs-primary) 30%, transparent);
}
.bbs-group-item {
    position: relative;
    padding: 0 20px;
    height: 42px;
}
.bbs-group-item::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 0;
    background: var(--bbs-primary);
    transition: width 0.15s ease;
}
.bbs-group-item:hover::before { width: 2px; }
.bbs-group-item:hover {
    background: color-mix(in srgb, var(--bbs-primary) 3%, var(--bbs-bg-card));
}
.bbs-group-item-title a:hover {
    color: var(--bbs-primary);
    text-decoration: none;
}

/* ========== 布局切换器美化 ========== */
.bbs-layout-switcher {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 0;
}
.bbs-layout-switcher-label {
    font-size: 12px;
    color: var(--bbs-text-muted);
    margin-right: 4px;
}
.bbs-layout-btn {
    width: 34px; height: 34px;
    border-radius: 8px;
    border: 1px solid transparent;
    transition: all 0.2s ease;
}
.bbs-layout-btn:hover {
    background: var(--bbs-bg-hover);
    border-color: var(--bbs-border);
    transform: scale(1.05);
}
.bbs-layout-btn.active {
    background: var(--bbs-primary-bg);
    color: var(--bbs-primary);
    border-color: color-mix(in srgb, var(--bbs-primary) 30%, transparent);
    box-shadow: 0 2px 6px color-mix(in srgb, var(--bbs-primary) 15%, transparent);
}

/* ========== 筛选栏/排序按钮美化 ========== */
.bbs-board-nav {
    padding: 12px 0;
    border-bottom: 1px solid var(--bbs-border-light);
}
.bbs-board-tab {
    padding: 6px 14px;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s ease;
}
.bbs-board-tab:hover {
    background: var(--bbs-bg-hover);
    transform: translateY(-1px);
}
.bbs-board-tab.active {
    background: var(--bbs-bg-card);
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    font-weight: 600;
}
.bbs-sort-btn {
    border-radius: 8px;
    transition: all 0.2s ease;
}
.bbs-sort-btn:hover {
    background: var(--bbs-primary-bg);
    transform: translateY(-1px);
}