/* =============================================
   交流圈 - 问答社区样式
   ============================================= */

/* ── Hero + 嵌入平台筛选（视觉对齐 knowledge_hub khi-hero） ── */
.comm-hero-wrap {
    max-width: 1400px;
    margin: 1.5rem auto 0;
    padding: 0 1.5rem;
}
.comm-hero {
    background: linear-gradient(
        135deg,
        var(--hero-indigo-from, #667eea) 0%,
        var(--hero-indigo-via, #6366f1) 55%,
        var(--hero-purple-to, #8b5cf6) 100%
    );
    border-radius: 16px;
    padding: 2.25rem 2rem 1.5rem;
    text-align: center;
    color: #fff;
}
.comm-hero-main {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: .75rem;
}
.comm-hero-title {
    font-size: 2rem;
    font-weight: 700;
    margin: 0;
    line-height: 1.3;
    color: #fff;
    letter-spacing: -.01em;
}
.comm-hero-title i { margin-right: .4rem; opacity: .9; }
.comm-hero-desc {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.82);
    line-height: 1.7;
    margin: 0 auto 1.25rem;
    max-width: 560px;
}

/* 平台筛选：叠在 Hero 底部，滚动后 sticky */
.comm-hero-filter {
    position: sticky;
    top: 0;
    z-index: 100;
    max-width: 100%;
    margin: 0;
    padding: 0 0 .25rem;
}
.comm-hero-filter-inner {
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    padding: 1rem 1.15rem 1.1rem;
    box-shadow: 0 12px 40px rgba(15, 23, 42, 0.18);
}
.comm-hero-filter-label {
    margin: 0 0 .75rem;
    font-size: .78rem;
    font-weight: 600;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.82);
    text-align: center;
}
.comm-filter-chips {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: .55rem;
}
.comm-chip {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: .35rem;
    padding: .7rem .45rem;
    min-height: 3.75rem;
    border-radius: .75rem;
    font-size: .95rem;
    font-weight: 600;
    border: 1.5px solid rgba(255, 255, 255, 0.35);
    color: rgba(255, 255, 255, 0.92);
    background: rgba(255, 255, 255, 0.08);
    cursor: pointer;
    text-decoration: none;
    transition: transform .18s, box-shadow .18s, background .18s, border-color .18s, color .18s;
}
.comm-chip-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.25);
}
.comm-chip-text {
    line-height: 1.2;
}
.comm-chip:hover {
    background: rgba(255, 255, 255, 0.18);
    border-color: rgba(255, 255, 255, 0.55);
    transform: translateY(-1px);
}
.comm-chip.active {
    background: #fff;
    border-color: #fff;
    color: #1e293b;
    font-weight: 700;
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(15, 23, 42, 0.2);
}
.comm-chip.active .comm-chip-dot {
    box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.08);
}
.comm-chip--taobao.active { color: #be123c; }
.comm-chip--jd.active     { color: #b45309; }
.comm-chip--pdd.active    { color: #86198f; }
.comm-chip--douyin.active { color: #15803d; }
.comm-chip--kuaishou.active { color: #c2410c; }
.comm-chip--vip.active      { color: #be185d; }
.comm-chip--dewu.active     { color: #0f766e; }
.comm-chip--other.active    { color: #475569; }
.comm-chip--taobao.active .comm-chip-text,
.comm-chip--jd.active .comm-chip-text,
.comm-chip--pdd.active .comm-chip-text,
.comm-chip--douyin.active .comm-chip-text,
.comm-chip--kuaishou.active .comm-chip-text,
.comm-chip--vip.active .comm-chip-text,
.comm-chip--dewu.active .comm-chip-text,
.comm-chip--other.active .comm-chip-text {
    color: inherit;
}

.comm-hero-filter-sentinel {
    height: 1px;
    width: 100%;
    pointer-events: none;
}

/* sticky 滚出 Hero 后：全宽白底 */
.comm-hero-filter.is-pinned {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
    padding: 0 1.5rem .85rem;
    max-width: none;
    margin-left: calc(50% - 50vw);
    margin-right: calc(50% - 50vw);
    width: 100vw;
    box-sizing: border-box;
}
.comm-hero-filter.is-pinned .comm-hero-filter-inner {
    max-width: 1400px;
    margin: 0 auto;
    background: var(--bg-card);
    border-color: var(--border-color);
    box-shadow: 0 4px 20px rgba(15, 23, 42, 0.1);
}
.comm-hero-filter.is-pinned .comm-hero-filter-label {
    color: var(--text-muted);
}
.comm-hero-filter.is-pinned .comm-chip {
    border-color: var(--border-color);
    color: var(--text-secondary);
    background: var(--bg-card);
}
.comm-hero-filter.is-pinned .comm-chip:hover {
    border-color: #c4b5fd;
    color: #6d28d9;
    background: #f5f3ff;
}
.comm-hero-filter.is-pinned .comm-chip.active {
    background: var(--bg-card);
    box-shadow: 0 6px 18px rgba(15, 23, 42, 0.12);
}

/* 交流圈：无渐变 hero，筛选条默认与吸顶后浅色样式一致 */
.comm-hero--plain {
    background: transparent;
    color: inherit;
}

.comm-hero--plain .comm-hero-title {
    color: var(--text-primary);
}

.comm-hero--plain .comm-hero-desc {
    color: var(--text-secondary);
}

.comm-hero--plain .comm-hero-filter-inner {
    background: var(--bg-card);
    border-color: var(--border-color);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    box-shadow: var(--shadow-sm);
}

.comm-hero--plain .comm-hero-filter-label {
    color: var(--text-muted);
}

.comm-hero--plain .comm-chip {
    border-color: var(--border-color);
    color: var(--text-secondary);
    background: var(--bg-card);
}

.comm-hero--plain .comm-chip:hover {
    border-color: #c4b5fd;
    color: #6d28d9;
    background: #f5f3ff;
}

.comm-hero--plain .comm-chip.active {
    background: var(--bg-card);
    box-shadow: var(--shadow-md);
}

.comm-hero--plain .comm-chip-dot {
    box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.08);
}

.comm-hero--plain .comm-ask-float {
    background: var(--accent-mint);
    border-color: var(--accent-mint-dark);
    color: #fff;
    backdrop-filter: none;
}

.comm-hero--plain .comm-ask-float:hover {
    background: var(--accent-mint-dark);
    border-color: var(--accent-mint-dark);
    box-shadow: var(--nav-register-shadow);
}

@media (max-width: 768px) {
    .comm-hero-filter-inner {
        padding: .85rem .75rem .9rem;
    }
    .comm-filter-chips {
        grid-template-columns: repeat(2, 1fr);
        gap: .5rem;
    }
    .comm-chip {
        min-height: 3.75rem;
        padding: .7rem .5rem;
        font-size: .88rem;
    }
}

@media (max-width: 640px) {
    .comm-hero-wrap {
        padding: 0 1rem;
        margin-top: 1rem;
    }
    .comm-hero {
        border-radius: 12px;
        padding: 1.75rem 1.25rem 1.25rem;
    }
    .comm-hero-title {
        font-size: 1.5rem;
    }
    .comm-hero-desc {
        margin-bottom: 1rem;
    }
    .comm-hero-filter-inner {
        padding: .85rem .75rem .9rem;
    }
    .comm-layout {
        padding: 0 1rem;
    }
}

/* ── 布局 ─────────────────────────────────── */
.comm-layout {
    max-width: 1400px;
    margin: 1rem auto 1.5rem;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: 248px 1fr;
    gap: 1.25rem;
    align-items: start;
}

/* 列表当前筛选上下文 */
.comm-list-context {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: .5rem .75rem;
    margin-bottom: .85rem;
    padding: .55rem .75rem;
    background: #f8fafc;
    border: 1px solid #e8edf3;
    border-radius: .5rem;
    font-size: .8rem;
}
.comm-list-context-label {
    font-weight: 700;
    color: #475569;
}
.comm-list-context-label i { margin-right: .2rem; color: #8b5cf6; }
.comm-list-context-tags { color: #6d28d9; font-weight: 500; }

/* ── 标签 Hub 专题页 ─────────────────────────── */
.comm-hub {
    background: linear-gradient(180deg, #faf5ff 0%, #fff 100%);
    border: 1px solid #ede9fe;
    border-radius: 1rem;
    padding: 1.25rem 1.35rem 1.35rem;
    margin-bottom: 1.25rem;
    box-shadow: 0 4px 24px rgba(109, 40, 217, 0.06);
}
.comm-hub-eyebrow {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .5rem;
    margin: 0 0 .45rem;
    font-size: .82rem;
    font-weight: 600;
    color: #7c3aed;
}
.comm-hub-eyebrow i { font-size: .9rem; }
.comm-hub-count {
    padding: .12rem .5rem;
    border-radius: 999px;
    background: #ede9fe;
    color: #6d28d9;
    font-size: .75rem;
    font-weight: 600;
}
.comm-hub-title {
    margin: 0;
    font-size: 1.35rem;
    font-weight: 800;
    color: #1e1b4b;
    letter-spacing: -.02em;
    line-height: 1.35;
}
.comm-hub-intro {
    margin: .85rem 0 0;
    font-size: .92rem;
    line-height: 1.75;
    color: #475569;
}
.comm-hub-highlights {
    list-style: none;
    margin: 1rem 0 0;
    padding: 0;
    display: grid;
    gap: .45rem;
}
.comm-hub-highlights li {
    display: flex;
    align-items: flex-start;
    gap: .4rem;
    font-size: .86rem;
    line-height: 1.55;
    color: #334155;
}
.comm-hub-highlights li i {
    color: #22c55e;
    margin-top: .15rem;
    flex-shrink: 0;
}
.comm-hub-hot {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid #ede9fe;
}
.comm-hub-hot-label,
.comm-hub-tools-label,
.comm-hub-links-label {
    margin: 0 0 .55rem;
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: #64748b;
}
.comm-hub-hot-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: .4rem;
}
.comm-hub-hot-list a {
    display: flex;
    align-items: flex-start;
    gap: .35rem;
    font-size: .88rem;
    line-height: 1.5;
    color: #4338ca;
    text-decoration: none;
}
.comm-hub-hot-list a:hover { color: #6d28d9; text-decoration: underline; }
.comm-hub-hot-list i { margin-top: .2rem; flex-shrink: 0; font-size: .85rem; }
.comm-hub-hot-list .ri-checkbox-circle-fill { color: #22c55e; }
.comm-hub-links {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid #ede9fe;
}
.comm-hub-links-list {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
}
.comm-hub-link-chip {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    padding: .4rem .75rem;
    border-radius: 999px;
    font-size: .82rem;
    font-weight: 600;
    text-decoration: none;
    transition: background .15s, border-color .15s;
}
.comm-hub-link-chip--external {
    background: #fff7ed;
    border: 1px solid #fed7aa;
    color: #c2410c;
}
.comm-hub-link-chip--external:hover {
    background: #ffedd5;
    border-color: #fdba74;
    color: #9a3412;
}
.comm-hub-tools {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid #ede9fe;
}
.comm-hub-tools-list {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
}
.comm-hub-tool-chip {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    padding: .4rem .75rem;
    border-radius: 999px;
    background: #fff;
    border: 1px solid #ddd6fe;
    color: #5b21b6;
    font-size: .82rem;
    font-weight: 600;
    text-decoration: none;
    transition: background .15s, border-color .15s;
}
.comm-hub-tool-chip:hover {
    background: #f5f3ff;
    border-color: #c4b5fd;
    color: #6d28d9;
}

/* ── 问题卡片 ─────────────────────────────── */
.comm-list { display: flex; flex-direction: column; gap: .75rem; }

.comm-card {
    border-radius: var(--radius-shell);
    border: 1px solid var(--glass-border-subtle);
    padding: 1.1rem 1.25rem;
    display: block;
    text-decoration: none;
    color: inherit;
    transition: border-color .18s, box-shadow .18s;
}
.comm-card:hover {
    border-color: #a78bfa;
    box-shadow: 0 4px 16px rgba(102,126,234,.12);
    color: inherit;
}
.comm-card-top {
    display: flex;
    align-items: flex-start;
    gap: .6rem;
    margin-bottom: .55rem;
}
.comm-card-badges {
    display: flex;
    gap: .35rem;
    flex-shrink: 0;
    padding-top: .1rem;
}
.comm-badge {
    display: inline-flex;
    align-items: center;
    gap: .2rem;
    padding: .18rem .55rem;
    border-radius: 9999px;
    font-size: .7rem;
    font-weight: 700;
    white-space: nowrap;
}
.comm-badge--pin   { background: #fef3c7; color: #b45309; }
.comm-badge--done  { background: #dcfce7; color: #166534; }
.comm-badge--taobao { background: #fff1f2; color: #e11d48; }
.comm-badge--jd     { background: #fef3c7; color: #b45309; }
.comm-badge--pdd    { background: #fdf4ff; color: #a21caf; }
.comm-badge--douyin { background: #f0fdf4; color: #16a34a; }
.comm-badge--kuaishou { background: #fff7ed; color: #c2410c; }
.comm-badge--vip      { background: #fdf2f8; color: #be185d; }
.comm-badge--dewu     { background: #f0fdfa; color: #0f766e; }
.comm-badge--other    { background: #f1f5f9; color: #475569; }
.comm-badge--all    { background: #f1f5f9; color: #64748b; }
.comm-badge--general { background: #eef2ff; color: #4338ca; }

.comm-card-title {
    font-size: 1rem;
    font-weight: 700;
    color: #1e293b;
    line-height: 1.4;
    margin: 0;
}
.comm-card:hover .comm-card-title { color: #6d28d9; }

.comm-card-excerpt {
    font-size: .85rem;
    color: #64748b;
    margin: 0 0 .65rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.comm-card-footer {
    display: flex;
    align-items: center;
    gap: .9rem;
    flex-wrap: wrap;
}
.comm-card-tags {
    display: flex;
    gap: .3rem;
    flex-wrap: wrap;
    flex: 1;
}
.comm-tag {
    display: inline-block;
    padding: .15rem .5rem;
    background: #f1f5f9;
    color: #475569;
    border-radius: 4px;
    font-size: .72rem;
    font-weight: 500;
}
.comm-card-meta {
    display: flex;
    gap: .75rem;
    align-items: center;
    color: #94a3b8;
    font-size: .78rem;
    white-space: nowrap;
}
.comm-card-meta i { margin-right: .2rem; }
.comm-meta-author { color: #64748b; font-weight: 500; }

/* ── 空状态 ───────────────────────────────── */
.comm-empty {
    text-align: center;
    padding: 4rem 2rem;
    color: #94a3b8;
}
.comm-empty i { font-size: 2.5rem; display: block; margin-bottom: .75rem; }

/* ── 分页 ─────────────────────────────────── */
.comm-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: .4rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}
.comm-page-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
    height: 2rem;
    padding: 0 .6rem;
    border-radius: .4rem;
    font-size: .85rem;
    font-weight: 500;
    color: #475569;
    background: #fff;
    border: 1px solid #e2e8f0;
    text-decoration: none;
    transition: all .15s;
}
.comm-page-btn:hover { border-color: #a78bfa; color: #7c3aed; background: #f5f3ff; }
.comm-page-btn.active {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    border-color: transparent;
    font-weight: 700;
}

/* ── 侧边栏（问题类型标签）── */
.comm-sidebar {
    display: flex;
    flex-direction: column;
    padding: .65rem;
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
    border-radius: .85rem;
    border: 1px solid #e2e8f0;
    position: sticky;
    top: 6.25rem;
}

.comm-sidebar-section {
    background: #fff;
    border-radius: .65rem;
    box-shadow:
        0 1px 2px rgba(15, 23, 42, .05),
        0 4px 14px rgba(15, 23, 42, .06);
    overflow: hidden;
}

.comm-sidebar-section-title {
    display: flex;
    align-items: center;
    gap: .45rem;
    flex: 1;
    font-size: .84rem;
    font-weight: 800;
    color: #1e293b;
}
.comm-sidebar-section-title i {
    font-size: 1rem;
    color: #8b5cf6;
}

.comm-sidebar-hint {
    margin: 0 0 .5rem;
    padding: 0 .15rem;
    font-size: .68rem;
    color: #94a3b8;
    line-height: 1.4;
}

.comm-sidebar-section-head {
    display: flex;
    align-items: center;
    gap: .45rem;
    padding: .7rem .85rem .65rem;
    font-size: .84rem;
    font-weight: 800;
    color: #1e293b;
    letter-spacing: .01em;
    border-bottom: 1px solid #e8edf3;
    background: linear-gradient(180deg, #fff 0%, #fafbfc 100%);
}
.comm-sidebar-section-head i {
    font-size: 1rem;
    color: #8b5cf6;
    flex-shrink: 0;
}
.comm-sidebar-section-head > span:first-of-type {
    flex: 1;
}

.comm-sidebar-filter-badge {
    font-size: .68rem;
    font-weight: 700;
    color: #6d28d9;
    background: #ede9fe;
    padding: .12rem .45rem;
    border-radius: 9999px;
    line-height: 1.2;
}

.comm-sidebar-section-body {
    padding: .5rem .65rem .65rem;
}
.comm-sidebar-section-body--flush {
    padding: .45rem .5rem .5rem;
}

.comm-sidebar-section-foot {
    padding: .5rem .65rem .65rem;
    border-top: 1px dashed #e2e8f0;
    background: #fafbfc;
}

/* L2：平台列表（分隔线式，非灰块堆叠） */
.comm-platform-list {
    display: flex;
    flex-direction: column;
    margin: 0;
    padding: 0;
}
.comm-platform-item {
    display: flex;
    align-items: center;
    gap: .55rem;
    padding: .52rem .55rem;
    border-bottom: 1px solid #f1f5f9;
    border-left: 3px solid transparent;
    border-radius: 0;
    background: transparent;
    font-size: .82rem;
    font-weight: 500;
    color: #64748b;
    text-decoration: none;
    transition: color .15s, background .15s, border-color .15s, box-shadow .15s;
}
.comm-platform-list .comm-platform-item:last-child {
    border-bottom: none;
}
.comm-platform-item:hover {
    background: #f8fafc;
    color: #334155;
}
.comm-platform-item.active {
    background: #fff;
    border-left-color: #8b5cf6;
    color: #0f172a;
    font-weight: 700;
    box-shadow: inset 0 0 0 1px #e8edf3;
}
.comm-platform-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    flex-shrink: 0;
    opacity: .85;
}
.comm-platform-item.active .comm-platform-dot {
    width: 8px;
    height: 8px;
    opacity: 1;
    box-shadow: 0 0 0 2px rgba(139, 92, 246, .22);
}

/* L2：标签分组 */
.comm-tag-groups {
    display: flex;
    flex-direction: column;
    gap: .45rem;
}
.comm-tag-group {
    border-radius: .5rem;
    border: 1px solid #e8edf3;
    background: #fff;
    overflow: hidden;
    transition: border-color .2s, box-shadow .2s;
}
.comm-tag-group:hover {
    border-color: #cbd5e1;
}
.comm-tag-group.expanded {
    box-shadow: 0 3px 12px rgba(15, 23, 42, .08);
}
.comm-tag-group.has-selection:not(.expanded) {
    border-color: #c4b5fd;
    box-shadow: 0 0 0 1px rgba(139, 92, 246, .12);
}

/* 组头 L2 */
.comm-tag-group-header {
    display: flex;
    align-items: center;
    gap: .45rem;
    padding: .62rem .7rem;
    cursor: pointer;
    background: #f8fafc;
    border-left: 4px solid transparent;
    transition: background .2s, border-color .2s;
    user-select: none;
}
.comm-tag-group.expanded .comm-tag-group-header {
    border-bottom: 1px solid #e8edf3;
}
.comm-tag-group.has-selection .comm-tag-group-header {
    border-left-width: 4px;
}

.group-flow .comm-tag-group-header { border-left-color: #f59e0b; }
.group-product .comm-tag-group-header { border-left-color: #3b82f6; }
.group-data .comm-tag-group-header { border-left-color: #10b981; }
.group-strategy .comm-tag-group-header { border-left-color: #8b5cf6; }
.group-other .comm-tag-group-header { border-left-color: #64748b; }

.group-flow.expanded { border-color: #fcd34d; }
.group-flow.expanded .comm-tag-group-header { background: #fffbeb; }
.group-flow.expanded .comm-tag-group-content { background: #fffbeb; }
.group-product.expanded { border-color: #93c5fd; }
.group-product.expanded .comm-tag-group-header { background: #eff6ff; }
.group-product.expanded .comm-tag-group-content { background: #eff6ff; }
.group-data.expanded { border-color: #6ee7b7; }
.group-data.expanded .comm-tag-group-header { background: #ecfdf5; }
.group-data.expanded .comm-tag-group-content { background: #ecfdf5; }
.group-strategy.expanded { border-color: #c4b5fd; }
.group-strategy.expanded .comm-tag-group-header { background: #f5f3ff; }
.group-strategy.expanded .comm-tag-group-content { background: #f5f3ff; }

.group-stage1 .comm-tag-group-header { border-left-color: #6366f1; }
.group-stage2 .comm-tag-group-header { border-left-color: #3b82f6; }
.group-stage3 .comm-tag-group-header { border-left-color: #06b6d4; }
.group-stage4 .comm-tag-group-header { border-left-color: #f59e0b; }
.group-stage5 .comm-tag-group-header { border-left-color: #10b981; }
.group-stage6 .comm-tag-group-header { border-left-color: #8b5cf6; }

.group-stage1.expanded { border-color: #a5b4fc; }
.group-stage1.expanded .comm-tag-group-header,
.group-stage1.expanded .comm-tag-group-content { background: #eef2ff; }
.group-stage2.expanded { border-color: #93c5fd; }
.group-stage2.expanded .comm-tag-group-header,
.group-stage2.expanded .comm-tag-group-content { background: #eff6ff; }
.group-stage3.expanded { border-color: #67e8f9; }
.group-stage3.expanded .comm-tag-group-header,
.group-stage3.expanded .comm-tag-group-content { background: #ecfeff; }
.group-stage4.expanded { border-color: #fcd34d; }
.group-stage4.expanded .comm-tag-group-header,
.group-stage4.expanded .comm-tag-group-content { background: #fffbeb; }
.group-stage5.expanded { border-color: #6ee7b7; }
.group-stage5.expanded .comm-tag-group-header,
.group-stage5.expanded .comm-tag-group-content { background: #ecfdf5; }
.group-stage6.expanded { border-color: #c4b5fd; }
.group-stage6.expanded .comm-tag-group-header,
.group-stage6.expanded .comm-tag-group-content { background: #f5f3ff; }

.comm-tag-group-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1rem;
    height: 1rem;
    color: #94a3b8;
    transition: transform .25s cubic-bezier(.4, 0, .2, 1), color .15s;
    font-size: .95rem;
}
.comm-tag-group-header:hover .comm-tag-group-arrow { color: #7c3aed; }
.comm-tag-group.expanded .comm-tag-group-arrow {
    transform: rotate(180deg);
    color: #6d28d9;
}

.comm-tag-group-name {
    flex: 1;
    font-size: .84rem;
    font-weight: 700;
    color: #334155;
}
.comm-tag-group.expanded .comm-tag-group-name { color: #0f172a; }

.comm-tag-group-selected {
    font-size: .62rem;
    font-weight: 700;
    color: #6d28d9;
    background: #ede9fe;
    padding: .08rem .35rem;
    border-radius: 3px;
    letter-spacing: .02em;
}

.comm-tag-group-count {
    font-size: .68rem;
    font-weight: 600;
    color: #64748b;
    background: #e2e8f0;
    padding: .1rem .38rem;
    border-radius: 9999px;
    min-width: 1.15rem;
    text-align: center;
}
.comm-tag-group.expanded .comm-tag-group-count {
    background: rgba(255, 255, 255, .75);
    color: #475569;
}

/* L3：标签内容凹层 */
.comm-tag-group-content {
    display: none;
    padding: .55rem .65rem .65rem;
    gap: .35rem;
    flex-wrap: wrap;
    background: #f8fafc;
}
.comm-tag-group.expanded .comm-tag-group-content {
    display: flex;
    animation: commTagFadeIn .2s ease;
}
@keyframes commTagFadeIn {
    from { opacity: 0; transform: translateY(-3px); }
    to { opacity: 1; transform: translateY(0); }
}

/* L3：标签 chip（轻量叶子） */
.comm-tag-checkbox {
    display: inline-flex;
    align-items: center;
    gap: .2rem;
    padding: .2rem .5rem;
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 4px;
    cursor: pointer;
    transition: border-color .15s, color .15s, background .15s, box-shadow .15s;
    font-size: .72rem;
    font-weight: 500;
    color: #64748b;
    position: relative;
}
.comm-tag-checkbox:hover {
    border-color: #c4b5fd;
    color: #6d28d9;
    background: #faf5ff;
}
.comm-tag-checkbox input { display: none; }
.comm-tag-checkbox.checked {
    background: #ede9fe;
    border-color: #8b5cf6;
    color: #5b21b6;
    font-weight: 600;
    box-shadow: 0 1px 3px rgba(109, 40, 217, .15);
}
.comm-tag-checkbox.checked::before {
    content: '';
    display: inline-block;
    width: .5rem;
    height: .5rem;
    background: #8b5cf6;
    border-radius: 2px;
    flex-shrink: 0;
}
.comm-tag-checkbox.checked::after {
    content: '';
    position: absolute;
    left: .62rem;
    width: .18rem;
    height: .32rem;
    border: solid #fff;
    border-width: 0 1.5px 1.5px 0;
    transform: rotate(45deg);
    margin-top: -.02rem;
}

/* 底部操作条 */
.comm-tags-clear {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .35rem;
    width: 100%;
    padding: .45rem .65rem;
    background: #fff;
    border: 1px dashed #fca5a5;
    border-radius: .45rem;
    font-size: .74rem;
    font-weight: 600;
    color: #b91c1c;
    cursor: pointer;
    transition: background .15s, border-color .15s;
}
.comm-tags-clear:hover {
    background: #fef2f2;
    border-color: #f87171;
}

/* ── 平台图标色 ───────────────────────────── */
.platform-taobao { color: #e11d48; }
.platform-jd     { color: #e58a00; }
.platform-pdd    { color: #a21caf; }
.platform-douyin { color: #16a34a; }
.platform-all    { color: #6366f1; }

/* =============================================
   详情页专属样式
   ============================================= */
.comm-detail-wrap {
    max-width: 900px;
    margin: 1.5rem auto;
    padding: 0 1.25rem;
}

/* 返回按钮 */
.comm-back-btn {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    color: #64748b;
    font-size: .875rem;
    text-decoration: none;
    margin-bottom: 1.2rem;
    transition: color .15s;
}
.comm-back-btn:hover { color: #6d28d9; }

/* 问题主体卡片 */
.comm-q-card {
    border-radius: var(--radius-shell);
    border: 1px solid var(--glass-border-subtle);
    padding: 1.5rem 1.75rem;
    margin-bottom: 1.5rem;
}
.comm-q-header {
    display: flex;
    align-items: flex-start;
    gap: .6rem;
    margin-bottom: .9rem;
}
.comm-q-title {
    font-size: 1.3rem;
    font-weight: 800;
    color: #1e293b;
    line-height: 1.4;
    flex: 1;
    margin: 0;
}
.comm-q-meta {
    display: flex;
    gap: 1rem;
    align-items: center;
    color: #94a3b8;
    font-size: .82rem;
    margin-bottom: 1.1rem;
    flex-wrap: wrap;
}
.comm-q-meta .comm-meta-author { color: #64748b; font-weight: 600; }
.comm-q-meta i { margin-right: .2rem; }

/* Markdown 渲染区域 */
.comm-markdown {
    font-size: .95rem;
    color: #374151;
    line-height: 1.75;
}
.comm-markdown h1, .comm-markdown h2, .comm-markdown h3 {
    font-weight: 700;
    color: #1e293b;
    margin: 1.2em 0 .5em;
    line-height: 1.35;
}
.comm-markdown h2 { font-size: 1.1rem; }
.comm-markdown h3 { font-size: 1rem; }
.comm-markdown p  { margin: .7em 0; }
.comm-markdown ul, .comm-markdown ol {
    padding-left: 1.4em;
    margin: .6em 0;
}
.comm-markdown li { margin: .3em 0; }
.comm-markdown strong { color: #1e293b; font-weight: 700; }
.comm-markdown code {
    background: #f1f5f9;
    padding: .1em .35em;
    border-radius: 4px;
    font-size: .88em;
    color: #7c3aed;
    font-family: monospace;
}
.comm-markdown pre {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: .5rem;
    padding: 1rem;
    overflow-x: auto;
    margin: .8em 0;
}
.comm-markdown pre code { background: none; padding: 0; color: #334155; }
.comm-markdown blockquote {
    border-left: 3px solid #a78bfa;
    padding: .4em 1em;
    color: #64748b;
    background: #f5f3ff;
    border-radius: 0 .4rem .4rem 0;
    margin: .8em 0;
}
.comm-markdown table {
    width: 100%;
    border-collapse: collapse;
    margin: .8em 0;
    font-size: .88rem;
}
.comm-markdown th {
    background: #f8fafc;
    font-weight: 700;
    text-align: left;
    padding: .5rem .75rem;
    border: 1px solid #e2e8f0;
    color: #475569;
}
.comm-markdown td {
    padding: .45rem .75rem;
    border: 1px solid #e2e8f0;
    color: #374151;
}
.comm-markdown tr:nth-child(even) td { background: #fafafa; }

/* 问题底部标签 */
.comm-q-footer {
    border-top: 1px solid #f1f5f9;
    margin-top: 1.2rem;
    padding-top: .9rem;
    display: flex;
    gap: .4rem;
    flex-wrap: wrap;
    align-items: center;
}

/* 回答区 */
.comm-answers-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: .9rem;
}
.comm-answers-title {
    font-size: 1rem;
    font-weight: 700;
    color: #1e293b;
    margin: 0;
}
.comm-answers-count {
    background: #f1f5f9;
    color: #64748b;
    font-size: .8rem;
    font-weight: 700;
    padding: .2rem .6rem;
    border-radius: 9999px;
}

.comm-answer-card {
    border-radius: var(--radius-shell);
    border: 1px solid var(--glass-border-subtle);
    padding: 1.2rem 1.5rem;
    margin-bottom: .85rem;
    position: relative;
}
.comm-answer-card--accepted {
    border-color: #86efac;
    background: linear-gradient(135deg, #f0fdf4 0%, #fff 60%);
}
.comm-answer-accepted-badge {
    position: absolute;
    top: -1px;
    right: 1.2rem;
    background: linear-gradient(135deg, #22c55e, #16a34a);
    color: #fff;
    font-size: .7rem;
    font-weight: 700;
    padding: .15rem .7rem;
    border-radius: 0 0 .5rem .5rem;
}
.comm-answer-meta {
    display: flex;
    gap: .9rem;
    align-items: center;
    color: #94a3b8;
    font-size: .8rem;
    margin-bottom: .85rem;
    flex-wrap: wrap;
}
.comm-answer-meta .comm-meta-author { color: #475569; font-weight: 600; }
.comm-answer-likes {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: .25rem;
    color: #94a3b8;
    font-size: .82rem;
    cursor: pointer;
    border: none;
    background: transparent;
    padding: .15rem .35rem;
    border-radius: .35rem;
    font-family: inherit;
    transition: background .15s, color .15s;
}
.comm-answer-likes:hover:not(:disabled) { background: #fef3c7; color: #78716c; }
.comm-answer-likes i { color: #f59e0b; }
.comm-answer-likes:disabled { cursor: default; opacity: .85; }
.comm-answer-likes.is-liked i { color: #ea580c; }

/* 相关问题侧栏 */
.comm-detail-layout {
    display: grid;
    grid-template-columns: 1fr 240px;
    gap: 1.5rem;
    max-width: 1060px;
    margin: 1.5rem auto;
    padding: 0 1.25rem;
    align-items: start;
}
@media (max-width: 768px) {
    .comm-detail-layout { grid-template-columns: 1fr; }
    .comm-detail-sidebar { display: none; }

    .comm-answer-card,
    .comm-question-card {
        padding: 1rem;
    }

    .comm-tag {
        min-height: 32px;
        display: inline-flex;
        align-items: center;
    }
}
.comm-related-card {
    border-radius: var(--radius-shell);
    border: 1px solid var(--glass-border-subtle);
    padding: 1rem 1.1rem;
    position: sticky;
    top: 72px;
}
.comm-related-title {
    font-size: .8rem;
    font-weight: 700;
    color: #94a3b8;
    text-transform: uppercase;
    letter-spacing: .05em;
    margin: 0 0 .75rem;
}
.comm-related-list { list-style: none; margin: 0; padding: 0; }
.comm-related-list li { border-top: 1px solid #f1f5f9; }
.comm-related-list li:first-child { border-top: none; }
.comm-related-link {
    display: block;
    padding: .6rem 0;
    font-size: .84rem;
    color: #475569;
    text-decoration: none;
    line-height: 1.4;
    transition: color .15s;
}
.comm-related-link:hover { color: #6d28d9; }

/* ── Hero 悬浮提问按钮 ───────────────────────── */
.comm-hero-actions {
    display: flex;
    align-items: center;
}
.comm-ask-float {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.4rem;
    height: 2.4rem;
    background: rgba(255,255,255,.15);
    border: 1.5px solid rgba(255,255,255,.4);
    border-radius: 50%;
    color: #fff;
    font-size: 1.1rem;
    cursor: pointer;
    text-decoration: none;
    transition: all .2s ease;
    backdrop-filter: blur(4px);
}
.comm-ask-float:hover {
    background: rgba(255,255,255,.25);
    border-color: rgba(255,255,255,.7);
    transform: scale(1.08);
    box-shadow: 0 4px 12px rgba(0,0,0,.15);
}
.comm-ask-float:active {
    transform: scale(0.95);
}

/* ── 提问弹窗 ─────────────────────────────── */
.comm-modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15,23,42,.45);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}
.comm-modal-overlay.active { display: flex; }

.comm-modal {
    background: #fff;
    border-radius: 1rem;
    width: 100%;
    max-width: 620px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0,0,0,.18);
    animation: commModalIn .2s ease;
}
@keyframes commModalIn {
    from { opacity: 0; transform: translateY(16px) scale(.97); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

.comm-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.2rem 1.5rem .9rem;
    border-bottom: 1px solid #f1f5f9;
}
.comm-modal-title {
    font-size: 1.05rem;
    font-weight: 800;
    color: #1e293b;
    margin: 0;
}
.comm-modal-title i { margin-right: .35rem; color: #6d28d9; }
.comm-modal-close {
    width: 2rem;
    height: 2rem;
    border: none;
    background: #f1f5f9;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: #64748b;
    transition: background .15s;
}
.comm-modal-close:hover { background: #e2e8f0; color: #1e293b; }

/* ── 通用表单样式（modal + 回答框共用）─────── */
.comm-ask-form { padding: 1.2rem 1.5rem 1.5rem; }

.comm-form-group { margin-bottom: 1rem; }
.comm-form-label {
    display: block;
    font-size: .82rem;
    font-weight: 600;
    color: #475569;
    margin-bottom: .35rem;
}
.comm-required { color: #e11d48; margin-left: .1rem; }
.comm-form-input,
.comm-form-select,
.comm-form-textarea {
    width: 100%;
    padding: .55rem .8rem;
    border: 1.5px solid #e2e8f0;
    border-radius: .5rem;
    font-size: .9rem;
    color: #1e293b;
    background: #fafafa;
    outline: none;
    transition: border-color .15s, box-shadow .15s;
    box-sizing: border-box;
    font-family: inherit;
}
.comm-form-input:focus,
.comm-form-select:focus,
.comm-form-textarea:focus {
    border-color: #a78bfa;
    box-shadow: 0 0 0 3px rgba(167,139,250,.15);
    background: #fff;
}
.comm-form-textarea { resize: vertical; min-height: 120px; line-height: 1.65; }
.comm-form-hint {
    font-size: .75rem;
    color: #94a3b8;
    text-align: right;
    margin-top: .25rem;
}
.comm-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: .75rem;
}
@media (max-width: 500px) { .comm-form-row { grid-template-columns: 1fr; } }

.comm-form-actions {
    display: flex;
    justify-content: flex-end;
    gap: .6rem;
    margin-top: 1rem;
}
.comm-btn-cancel {
    padding: .5rem 1.2rem;
    border: 1.5px solid #e2e8f0;
    background: #fff;
    border-radius: .5rem;
    font-size: .88rem;
    color: #64748b;
    cursor: pointer;
    transition: all .15s;
}
.comm-btn-cancel:hover { border-color: #cbd5e1; background: #f8fafc; }
.comm-btn-submit {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    padding: .5rem 1.3rem;
    background: linear-gradient(135deg, var(--hero-indigo-from), var(--hero-indigo-to));
    color: #fff;
    border: none;
    border-radius: .5rem;
    font-size: .88rem;
    font-weight: 700;
    cursor: pointer;
    transition: opacity .15s;
}
.comm-btn-submit:hover { opacity: .9; }
.comm-btn-submit:disabled { opacity: .6; cursor: not-allowed; }

.comm-form-msg {
    padding: .6rem .9rem;
    border-radius: .45rem;
    font-size: .85rem;
    font-weight: 500;
}
.comm-form-msg--ok { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }
.comm-form-msg--err { background: #fff1f2; color: #be123c; border: 1px solid #fecdd3; }

/* ── 详情页回答表单 ────────────────────────── */
.comm-reply-box {
    background: #fff;
    border-radius: .9rem;
    border: 1px solid #e8edf3;
    padding: 1.25rem 1.5rem;
    margin-top: 1.5rem;
    box-shadow: 0 2px 8px rgba(0,0,0,.04);
}
.comm-reply-title {
    font-size: 1rem;
    font-weight: 700;
    color: #1e293b;
    margin: 0 0 1rem;
}
.comm-reply-title i { margin-right: .35rem; color: #6d28d9; }

.comm-reply-login {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    padding: 1.2rem;
    margin-top: 1.5rem;
    background: #f8fafc;
    border: 1px dashed #cbd5e1;
    border-radius: .75rem;
    color: #64748b;
    font-size: .9rem;
}
.comm-reply-login a { color: #6d28d9; font-weight: 600; text-decoration: none; }
.comm-reply-login a:hover { text-decoration: underline; }

/* ── 窄屏布局：阶段侧栏与问答列表纵向堆叠（须在 .comm-sidebar 基础样式之后）── */
@media (max-width: 1024px) {
    .comm-layout {
        grid-template-columns: 1fr;
    }

    .comm-sidebar {
        position: static;
        top: auto;
    }
}

@media (max-width: 768px) {
    .comm-layout {
        gap: 1rem;
    }

    .comm-sidebar {
        display: flex;
        position: static;
        top: auto;
        margin-bottom: 0.5rem;
    }

    .comm-card-top {
        flex-wrap: wrap;
        gap: .45rem;
    }

    .comm-card-badges {
        width: 100%;
        flex-wrap: wrap;
    }

    .comm-card-title {
        flex: 0 0 100%;
        width: 100%;
    }

    .comm-card-footer {
        align-items: flex-start;
        gap: .5rem;
    }

    .comm-card-tags {
        flex: none;
        flex-basis: 100%;
    }

    .comm-card-tags .comm-tag {
        white-space: nowrap;
    }

    .comm-card-meta {
        width: 100%;
        flex-wrap: wrap;
        white-space: normal;
    }
}