/* ═══════════════════════════════════════════
       BBS HOMEPAGE · 贴吧风格重新设计
       全宽布局 · 顶部Tab导航 · 无侧边栏
       ═══════════════════════════════════════════ */

    /* ── Hero ── */
    .bbs-home-hero {
      padding: clamp(2rem, 4vw, 3.5rem) 0 clamp(1.5rem, 2.5vw, 2rem);
      text-align: center;
      border-bottom: 1px solid var(--ui-line);
      margin-bottom: 0;
      position: relative;
    }
    .bbs-home-hero-title {
      font-family: var(--font-serif);
      font-size: clamp(2rem, 4vw, 2.75rem);
      font-weight: 700; letter-spacing: -0.04em;
      line-height: 1.2; margin-bottom: 4px;
    }
    .bbs-home-hero-desc {
      font-family: var(--font-mono); font-size: clamp(0.58rem, 0.85vw, 0.68rem);
      text-transform: uppercase; letter-spacing: 0.14em;
      color: var(--ui-fg-muted); margin-bottom: var(--gap-lg);
    }
    .bbs-home-hero-actions {
      display: flex; gap: var(--gap-sm); justify-content: center;
      margin-bottom: var(--gap-xl); flex-wrap: wrap;
    }
    .bbs-home-hero-actions .btn {
      font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em;
      padding: 10px 22px;
    }
    .bbs-home-hero-actions .btn-primary {
      background: var(--ui-accent, #8b7cf7);
      color: #fff; border-color: var(--ui-accent, #8b7cf7);
    }
    .bbs-home-hero-actions .btn-primary:hover { opacity: 0.88; }
    .bbs-home-hero-stats {
      display: flex; gap: var(--gap-2xl); justify-content: center; align-items: center;
    }
    .bbs-home-hero-stat {
      display: flex; flex-direction: column; align-items: center; gap: 2px;
      cursor: pointer; padding: 4px 12px; transition: color var(--dur-fast);
    }
    .bbs-home-hero-stat:hover .bbs-home-hero-stat-num { color: var(--ui-accent); }
    .bbs-home-hero-stat-num {
      font-family: var(--font-mono); font-size: 1.35rem; font-weight: 700;
      transition: color var(--dur-fast);
    }
    .bbs-home-hero-stat-label {
      font-family: var(--font-mono); font-size: 0.58rem;
      text-transform: uppercase; letter-spacing: 0.1em; color: var(--ui-fg-muted);
    }
    .bbs-home-hero-stat-sep {
      width: 1px; height: 32px; background: var(--ui-line);
    }

    /* ═══════════════════════════════════════════
       TOP TAB NAVIGATION (贴吧风格)
       ═══════════════════════════════════════════ */
    .bbs-nav-bar {
      display: flex; align-items: center;
      background: var(--ui-surface);
      border-bottom: 1px solid var(--ui-line);
      position: sticky; top: 0; z-index: 50;
      padding: 0 var(--gap-lg);
      overflow-x: auto;
      -webkit-overflow-scrolling: touch;
    }
    .bbs-nav-tab {
      display: flex; align-items: center; gap: 8px;
      padding: 14px 20px; font-family: var(--font-mono);
      font-size: 0.72rem; font-weight: 500;
      color: var(--ui-fg-muted); cursor: pointer;
      border: none; background: none;
      border-bottom: 3px solid transparent;
      white-space: nowrap; letter-spacing: 0.04em;
      transition: all var(--dur-fast) var(--ease-out);
      position: relative;
    }
    .bbs-nav-tab:hover { color: var(--ui-fg); background: var(--ui-overlay); }
    .bbs-nav-tab.active {
      color: var(--ui-fg); font-weight: 600;
      border-bottom-color: var(--ui-accent, #8b7cf7);
    }
    .bbs-nav-tab i { font-size: 0.85rem; }
    .bbs-nav-tab .badge-dot {
      width: 7px; height: 7px; border-radius: 50%; background: #ef4444;
      position: absolute; top: 10px; right: 10px;
      display: none;
    }
    .bbs-nav-tab .badge-dot.show { display: block; }

    /* ── Tab Panels ── */
    .bbs-tab-panel { display: none; padding-top: var(--gap-xl); padding-bottom: var(--gap-2xl); }
    .bbs-tab-panel.active { display: block; }

    /* ═══════════════════════════════════════════
       SECTION HEADERS
       ═══════════════════════════════════════════ */
    .bbs-section-header {
      display: flex; align-items: center; justify-content: space-between;
      margin-bottom: var(--gap-lg); padding-bottom: var(--gap-sm);
      border-bottom: 1px solid var(--ui-line);
      flex-wrap: wrap; gap: var(--gap-sm);
    }
    .bbs-section-title {
      font-family: var(--font-mono); font-size: 0.7rem;
      text-transform: uppercase; letter-spacing: 0.1em;
      color: var(--ui-fg-muted);
      display: flex; align-items: center; gap: 8px;
    }
    .bbs-section-title::before {
      content: ''; width: 8px; height: 2px; background: var(--ui-accent, #8b7cf7);
      flex-shrink: 0;
    }

    /* ═══════════════════════════════════════════
       FORUM CARDS (贴吧风格 吧卡片)
       ═══════════════════════════════════════════ */
    .forum-cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
      gap: var(--gap-md);
    }
    .forum-card-tieba {
      background: var(--ui-surface);
      border: 1px solid var(--ui-line);
      padding: var(--gap-lg);
      text-decoration: none; color: var(--ui-fg);
      display: flex; gap: var(--gap-md); align-items: flex-start;
      transition: all var(--dur-fast) var(--ease-out);
      border-radius: 4px;
    }
    .forum-card-tieba:hover {
      border-color: var(--ui-line-hover);
      background: var(--ui-surface-2);
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    .forum-card-tieba .fct-icon {
      width: 52px; height: 52px; min-width: 52px;
      background: var(--ui-bg); border: 1px solid var(--ui-line);
      display: flex; align-items: center; justify-content: center;
      font-size: 1.5rem; border-radius: 4px;
    }
    .forum-card-tieba .fct-body { flex: 1; min-width: 0; }
    .forum-card-tieba .fct-name {
      font-family: var(--font-serif); font-size: 1.05rem; font-weight: 600;
      letter-spacing: -0.01em; margin-bottom: 4px;
    }
    .forum-card-tieba .fct-desc {
      font-size: 0.76rem; color: var(--ui-fg-muted); line-height: 1.5;
      display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
      overflow: hidden; margin-bottom: var(--gap-sm);
    }
    .forum-card-tieba .fct-meta {
      display: flex; gap: var(--gap-lg); font-family: var(--font-mono);
      font-size: 0.62rem; color: var(--ui-fg-muted);
    }
    .forum-card-tieba .fct-meta span { display: flex; align-items: center; gap: 4px; }

    /* ── Forum Groups ── */
    .forum-group-section {
      margin-bottom: var(--gap-2xl);
    }
    .forum-group-section:last-child { margin-bottom: 0; }
    .forum-group-label {
      font-family: var(--font-mono); font-size: 0.65rem;
      text-transform: uppercase; letter-spacing: 0.12em;
      color: var(--ui-fg-muted);
      margin-bottom: var(--gap-md);
      display: flex; align-items: center; gap: var(--gap-sm);
    }
    .forum-group-label::before {
      content: ''; width: 6px; height: 2px; background: var(--ui-accent, #8b7cf7);
      flex-shrink: 0;
    }

    /* ═══════════════════════════════════════════
       FEED SECTION (动态)
       ═══════════════════════════════════════════ */
    .feed-publish-wrap {
      margin-bottom: var(--gap-lg);
      background: var(--ui-surface);
      border: 1px solid var(--ui-line);
      padding: var(--gap-md);
      border-radius: 4px;
    }
    .feed-publish-row {
      display: flex; gap: var(--gap-sm); align-items: flex-end;
    }
    .feed-publish-row input {
      flex: 1; padding: 10px 14px; background: var(--ui-bg);
      color: var(--ui-fg); border: 1px solid var(--ui-line);
      font-family: var(--font-sans); font-size: 0.85rem; border-radius: 4px;
    }
    .feed-publish-row input:focus { outline: none; border-color: var(--ui-accent, #8b7cf7); }
    .feed-publish-row input::placeholder { color: var(--ui-fg-muted); }

    /* Feed list container */
    #bbs-feeds-container {
      background: var(--ui-surface); border: 1px solid var(--ui-line); border-radius: 4px;
    }
    /* Feed item — matches JS-generated .bbs-feed-item */
    .bbs-feed-item {
      display: flex; gap: var(--gap-md); padding: var(--gap-md) var(--gap-lg);
      border-bottom: 1px solid var(--ui-line); align-items: flex-start;
    }
    .bbs-feed-item:last-child { border-bottom: none; }
    .bbs-feed-avatar {
      width: 36px; height: 36px; min-width: 36px;
      background: var(--ui-bg); border: 1px solid var(--ui-line);
      display: flex; align-items: center; justify-content: center;
      font-family: var(--font-serif); font-size: 0.9rem; font-weight: 600;
      color: var(--ui-fg); border-radius: 50%; flex-shrink: 0;
    }
    .bbs-feed-body { flex: 1; min-width: 0; }
    .bbs-feed-meta {
      display: flex; align-items: center; gap: var(--gap-sm); margin-bottom: 4px;
    }
    .bbs-feed-author { font-weight: 500; font-size: 0.82rem; letter-spacing: -0.01em; }
    .bbs-feed-time {
      font-family: var(--font-mono); font-size: 0.62rem; color: var(--ui-fg-muted);
    }
    .bbs-feed-content {
      font-size: 0.82rem; line-height: 1.7; color: var(--ui-fg-muted);
      word-break: break-word;
    }
    .bbs-feed-empty {
      padding: var(--gap-2xl); text-align: center;
      color: var(--ui-fg-muted); font-size: 0.85rem;
    }
    .bbs-feed-more {
      padding: var(--gap-md); text-align: center;
      border-top: 1px solid var(--ui-line);
    }

    /* ═══════════════════════════════════════════
       GROUP CARDS (群组)
       ═══════════════════════════════════════════ */
    .group-cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: var(--gap-md);
    }
    .group-card-home {
      background: var(--ui-surface); border: 1px solid var(--ui-line);
      padding: var(--gap-lg); border-radius: 4px;
      text-decoration: none; color: var(--ui-fg); display: block;
      transition: all var(--dur-fast) var(--ease-out);
    }
    .group-card-home:hover {
      border-color: var(--ui-line-hover);
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    .group-card-home .gch-header {
      display: flex; align-items: center; gap: var(--gap-sm); margin-bottom: var(--gap-sm);
    }
    .group-card-home .gch-icon {
      width: 40px; height: 40px; border-radius: 50%;
      background: var(--ui-bg); border: 1px solid var(--ui-line);
      display: flex; align-items: center; justify-content: center;
      font-size: 1rem;
    }
    .group-card-home .gch-name {
      font-family: var(--font-serif); font-size: 1rem; font-weight: 600;
      letter-spacing: -0.01em;
    }
    .group-card-home .gch-desc {
      font-size: 0.78rem; color: var(--ui-fg-muted); line-height: 1.5;
      display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
      overflow: hidden; margin-bottom: var(--gap-sm);
    }
    .group-card-home .gch-meta {
      display: flex; gap: var(--gap-lg); font-family: var(--font-mono);
      font-size: 0.62rem; color: var(--ui-fg-muted);
      padding-top: var(--gap-sm); border-top: 1px solid var(--ui-line);
    }

    /* ═══════════════════════════════════════════
       MESSAGES & PROFILE PREVIEW CARDS
       ═══════════════════════════════════════════ */
    .feature-cards-row {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: var(--gap-lg);
    }
    .feature-card {
      background: var(--ui-surface); border: 1px solid var(--ui-line);
      padding: var(--gap-xl); border-radius: 4px;
      text-decoration: none; color: var(--ui-fg); display: flex; gap: var(--gap-lg);
      align-items: flex-start; transition: all var(--dur-fast) var(--ease-out);
    }
    .feature-card:hover {
      border-color: var(--ui-line-hover);
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    .feature-card .fc-icon-wrap {
      width: 56px; height: 56px; min-width: 56px;
      background: var(--ui-bg); border: 1px solid var(--ui-line);
      display: flex; align-items: center; justify-content: center;
      font-size: 1.4rem; border-radius: 4px;
    }
    .feature-card .fc-body { flex: 1; min-width: 0; }
    .feature-card .fc-title {
      font-family: var(--font-serif); font-size: 1.05rem; font-weight: 600;
      letter-spacing: -0.01em; margin-bottom: 4px;
    }
    .feature-card .fc-desc {
      font-size: 0.78rem; color: var(--ui-fg-muted); line-height: 1.6;
    }
    .feature-card .fc-arrow {
      align-self: center; font-size: 1.1rem; color: var(--ui-fg-muted);
      transition: transform var(--dur-fast);
    }
    .feature-card:hover .fc-arrow { transform: translateX(4px); color: var(--ui-fg); }

    /* ═══════════════════════════════════════════
       MEMBER INFO INLINE
       ═══════════════════════════════════════════ */
    .member-info-row {
      display: flex; align-items: center; gap: var(--gap-md);
      padding: var(--gap-md) var(--gap-lg);
      background: var(--ui-surface); border: 1px solid var(--ui-line);
      border-radius: 4px; margin-bottom: var(--gap-lg); flex-wrap: wrap;
    }
    .member-info-row .mir-avatar {
      width: 40px; height: 40px; border-radius: 50%;
      background: var(--ui-bg); border: 1px solid var(--ui-line);
      display: flex; align-items: center; justify-content: center;
      font-family: var(--font-serif); font-weight: 700; font-size: 1rem;
    }
    .member-info-row .mir-name { font-weight: 600; font-size: 0.9rem; }
    .member-info-row .mir-badge {
      font-family: var(--font-mono); font-size: 0.62rem;
      padding: 2px 8px; border: 1px solid var(--ui-line);
    }

    /* ═══════════════════════════════════════════
       EMPTY / LOADING
       ═══════════════════════════════════════════ */
    .bbs-loading-wrap {
      display: flex; align-items: center; justify-content: center;
      padding: var(--gap-3xl); color: var(--ui-fg-muted);
      font-family: var(--font-mono); font-size: 0.72rem;
      flex-direction: column; gap: var(--gap-sm);
    }
    .bbs-loading-dots { display: flex; gap: 6px; }
    .bbs-loading-dots span {
      width: 6px; height: 6px; border-radius: 50%;
      background: var(--ui-accent, #8b7cf7);
      animation: bbsDot 1.2s ease-in-out infinite;
    }
    .bbs-loading-dots span:nth-child(2) { animation-delay: 0.15s; }
    .bbs-loading-dots span:nth-child(3) { animation-delay: 0.3s; }
    @keyframes bbsDot {
      0%, 80%, 100% { opacity: 0.2; transform: scale(0.8); }
      40% { opacity: 1; transform: scale(1.2); }
    }

    /* ── Responsive ── */
    @media (max-width: 768px) {
      .bbs-nav-bar { padding: 0 var(--gap-sm); }
      .bbs-nav-tab { padding: 12px 14px; font-size: 0.68rem; gap: 5px; }
      .bbs-nav-tab i { font-size: 0.75rem; }
      .forum-cards-grid { grid-template-columns: 1fr; }
      .group-cards-grid { grid-template-columns: 1fr; }
      .feature-cards-row { grid-template-columns: 1fr; }
      .bbs-home-hero-stats { gap: var(--gap-lg); }
      .bbs-home-hero-stat-num { font-size: 1.1rem; }
      .bbs-home-hero-actions { flex-direction: column; align-items: center; }
      .feed-publish-row { flex-direction: column; }
      .feed-publish-row .btn { width: 100%; }
    }
    @media (max-width: 480px) {
      .bbs-home-hero-title { font-size: 1.5rem; }
      .bbs-home-hero-stats { gap: var(--gap-md); }
      .bbs-home-hero-stat-sep { display: none; }
      .bbs-nav-tab { padding: 10px 12px; font-size: 0.62rem; }
    }