:root {
      --bg-deep: #09090b;
      --bg-card: #18181b;
      --bg-elevated: #27272a;
      --border: #3f3f46;
      --border-hover: #52525b;
      --text-primary: #fafafa;
      --text-secondary: #a1a1aa;
      --text-muted: #71717a;
      --accent: #60a5fa;
      --accent-dim: #3b82f6;
      --accent-glow: rgba(96, 165, 250, 0.12);
      --gradient-accent: linear-gradient(135deg, #60a5fa 0%, #a78bfa 100%);
      --success: #34d399;
      --warning: #fbbf24;
      --radius: 12px;
      --radius-sm: 8px;
      --radius-xs: 6px;
      --shadow: 0 4px 24px rgba(0,0,0,0.3);
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
      --transition: 0.15s ease;
      --header-h: 56px;
      --accent-secondary: #a78bfa;
      --bg-glass: rgba(24, 24, 27, 0.6);
      --border-glow: rgba(96, 165, 250, 0.25);
      --gradient-hero: linear-gradient(135deg, rgba(96,165,250,0.12) 0%, rgba(167,139,250,0.12) 50%, rgba(244,114,182,0.08) 100%);
    }
    * { box-sizing: border-box; margin: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: 'Inter', system-ui, -apple-system, sans-serif;
      background: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.6;
      min-height: 100vh;
      padding: 0;
    }

    /* ─── HEADER: Logo + Nav + Status ─── */
    .site-header {
      height: var(--header-h);
      padding: 0 24px;
      display: flex;
      align-items: center;
      gap: 32px;
      background: var(--bg-card);
      border-bottom: 1px solid var(--border);
      position: sticky;
      top: 0;
      z-index: 100;
      backdrop-filter: blur(12px);
      background: rgba(24, 24, 27, 0.85);
    }
    .site-logo {
      font-family: 'Plus Jakarta Sans', system-ui, sans-serif;
      font-size: 20px;
      font-weight: 800;
      letter-spacing: -0.04em;
      background: var(--gradient-accent);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      flex-shrink: 0;
      cursor: pointer;
    }
    .site-nav {
      display: flex;
      gap: 4px;
      flex: 1;
    }
    .site-nav a {
      padding: 6px 16px;
      font-family: 'Plus Jakarta Sans', sans-serif;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      text-decoration: none;
      border-radius: var(--radius-xs);
      transition: color 0.25s ease, background 0.25s ease;
      position: relative;
    }
    .site-nav a:hover { color: var(--text-primary); background: var(--bg-elevated); }
    .site-nav a.active { color: var(--text-primary); background: var(--bg-elevated); }
    .site-nav a::after {
      content: '';
      position: absolute;
      bottom: -1px;
      left: 50%;
      right: 50%;
      height: 2px;
      background: var(--gradient-accent);
      border-radius: 1px;
      transition: left 0.25s ease, right 0.25s ease;
    }
    .site-nav a:hover::after { left: 16px; right: 16px; }
    .site-nav a.active::after { left: 8px; right: 8px; }
    .nav-recommend-highlight:not(.active) {
      background: linear-gradient(135deg, rgba(255,107,53,0.12), rgba(255,165,0,0.12));
      color: #ff8c00 !important;
      font-weight: 600;
      border-radius: var(--radius-xs);
      animation: navGlow 3s ease-in-out infinite;
    }
    @keyframes navGlow { 0%,100% { box-shadow: none; } 50% { box-shadow: 0 0 12px rgba(255,140,0,0.25); } }
    .header-right {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }
    .status-dot {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      color: var(--text-muted);
    }
    .status-dot::before {
      content: '';
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--success);
      animation: pulse 2s infinite;
    }
    @keyframes pulse { 0%,100%{opacity:1}50%{opacity:0.3} }
    .btn-icon {
      width: 32px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--border);
      border-radius: var(--radius-xs);
      background: transparent;
      color: var(--text-secondary);
      cursor: pointer;
      font-size: 15px;
      transition: all var(--transition);
    }
    .btn-icon:hover { color: var(--text-primary); border-color: var(--border-hover); background: var(--bg-elevated); }

    /* ─── PAGE CONTAINER ─── */
    .page { display: none; }
    .page.active { display: block; animation: pageEnter 0.3s ease forwards; }
    @keyframes pageEnter {
      from { opacity: 0; transform: translateY(12px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* ─── HOMEPAGE ─── */
    .home-container {
      max-width: 900px; margin: 0 auto; padding: 60px 24px 80px; text-align: center;
      position: relative;
    }
    .home-container::before {
      content: '';
      position: absolute;
      bottom: -120px; left: -140px;
      width: 600px; height: 600px;
      background: url('/mascot.png') center/contain no-repeat;
      opacity: 0.035;
      pointer-events: none;
      z-index: 0;
      filter: brightness(2.5);
      transform: scaleX(-1);
    }
    .home-container > * { position: relative; z-index: 1; }
    .home-hero { margin-bottom: 48px; }
    .home-mascot {
      width: 72px; height: 72px; border-radius: 18px;
      margin-bottom: 20px;
      filter: drop-shadow(0 4px 24px rgba(96,165,250,0.2));
      animation: mascotFloat 4s ease-in-out infinite;
    }
    @keyframes mascotFloat {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-6px); }
    }
    .home-logo {
      font-family: 'Plus Jakarta Sans', sans-serif; font-size: 14px; font-weight: 700;
      letter-spacing: 3px; text-transform: uppercase; color: var(--accent); margin-bottom: 16px;
    }
    .home-title {
      font-family: 'Plus Jakarta Sans', sans-serif; font-size: 40px; font-weight: 800;
      background: linear-gradient(135deg, var(--accent), #a78bfa, #34d399);
      -webkit-background-clip: text; -webkit-text-fill-color: transparent;
      background-clip: text;
      margin: 0 0 12px; line-height: 1.2;
    }
    .home-subtitle { font-size: 16px; color: var(--text-secondary); line-height: 1.6; max-width: 500px; margin: 0 auto; margin-bottom: 24px; }
    .home-hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
    .hero-cta-primary {
      padding: 12px 28px; font-size: 15px; font-weight: 700;
      background: linear-gradient(135deg, #60a5fa 0%, #a78bfa 100%);
      color: #fff; border: none; border-radius: 50px; cursor: pointer;
      transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
      box-shadow: 0 4px 20px rgba(96,165,250,0.3);
      font-family: 'Plus Jakarta Sans', sans-serif;
    }
    .hero-cta-primary:hover {
      transform: translateY(-2px) scale(1.02);
      box-shadow: 0 8px 32px rgba(96,165,250,0.45);
    }
    .hero-cta-secondary {
      padding: 12px 28px; font-size: 15px; font-weight: 600;
      background: rgba(51,65,85,0.4);
      backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
      color: var(--text-secondary); border: 1px solid rgba(148,163,184,0.15);
      border-radius: 50px; cursor: pointer;
      transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
      font-family: 'Plus Jakarta Sans', sans-serif;
    }
    .hero-cta-secondary:hover {
      color: var(--text-primary);
      border-color: rgba(96,165,250,0.3);
      transform: translateY(-1px);
    }
    .home-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-bottom: 48px; }
    .home-card {
      background: rgba(30,41,59,0.6); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(148,163,184,0.12); border-radius: 16px;
      padding: 32px 24px; cursor: pointer; transition: all 0.3s ease;
      text-align: left;
    }
    .home-card:hover { border-color: var(--accent); transform: translateY(-4px); box-shadow: 0 12px 40px rgba(96,165,250,0.15); }
    .home-card-featured {
      grid-column: 1 / -1;
      background: linear-gradient(135deg, rgba(255,107,53,0.08), rgba(255,165,0,0.06), rgba(30,41,59,0.6));
      border-color: rgba(255,140,0,0.3);
      position: relative;
      overflow: hidden;
    }
    .home-card-featured:hover { border-color: #ff8c00; box-shadow: 0 12px 40px rgba(255,140,0,0.15); }
    .home-card-featured::after {
      content: ''; position: absolute; top: -50%; right: -20%; width: 200px; height: 200px;
      background: radial-gradient(circle, rgba(255,140,0,0.08) 0%, transparent 70%);
      pointer-events: none;
    }
    .home-card-badge {
      position: absolute; top: 12px; right: 16px; font-size: 11px; font-weight: 600;
      color: #ff8c00; background: rgba(255,140,0,0.12); padding: 3px 10px; border-radius: 20px;
    }
    .home-card-icon {
      width: 48px; height: 48px; border-radius: 12px; display: flex; align-items: center; justify-content: center;
      background: linear-gradient(135deg, rgba(96,165,250,0.15), rgba(167,139,250,0.15));
      margin-bottom: 16px; color: var(--accent);
    }
    .home-card-icon svg { width: 24px; height: 24px; }
    .home-card h3 { font-family: 'Plus Jakarta Sans', sans-serif; font-size: 18px; font-weight: 700; margin: 0 0 8px; color: var(--text-primary); }
    .home-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; margin: 0; }
    .home-stats { display: flex; justify-content: center; gap: 48px; }
    .home-stat { text-align: center; }
    .home-stat-num { display: block; font-family: 'Plus Jakarta Sans', sans-serif; font-size: 28px; font-weight: 800; color: var(--text-primary); }
    .home-stat-label { font-size: 12px; color: var(--text-muted); margin-top: 4px; display: block; }
    .home-card { opacity: 0; animation: homeFadeIn 0.6s ease forwards; }
    .home-card:nth-child(1) { animation-delay: 0.1s; }
    .home-card:nth-child(2) { animation-delay: 0.2s; }
    .home-card:nth-child(3) { animation-delay: 0.3s; }
    .home-card:nth-child(4) { animation-delay: 0.4s; }
    @keyframes homeFadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
    @media (max-width: 640px) {
      .home-title { font-size: 28px; }
      .home-grid { grid-template-columns: 1fr; }
      .home-stats { gap: 24px; }
      .home-stat-num { font-size: 22px; }
      .home-mascot { width: 56px; height: 56px; border-radius: 14px; }
      .home-container::before { width: 360px; height: 360px; bottom: -80px; left: -80px; }
    }

    /* ─── NEWS PAGE ─── */
    .news-page { max-width: 1200px; margin: 0 auto; padding: 20px 24px 48px; }
    .news-toolbar {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 0;
      flex-wrap: wrap;
      border-bottom: 1px solid var(--border);
      margin-bottom: 16px;
    }
    .news-toolbar-left { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
    .news-toolbar-right { margin-left: auto; display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
    .filter-chip {
      padding: 5px 12px;
      font-size: 13px;
      font-weight: 500;
      background: transparent;
      color: var(--text-muted);
      border: 1px solid var(--border);
      border-radius: 999px;
      cursor: pointer;
      transition: all var(--transition);
    }
    .filter-chip:hover { color: var(--text-secondary); border-color: var(--border-hover); }
    .filter-chip.active { background: var(--accent); color: var(--bg-deep); border-color: var(--accent); }
    .news-update-info {
      font-size: 12px;
      color: var(--text-muted);
    }
    .news-new-badge {
      font-size: 11px;
      padding: 2px 8px;
      background: var(--accent);
      color: var(--bg-deep);
      border-radius: 999px;
      font-weight: 600;
    }
    .news-new-badge.hide { display: none; }
    .news-brief-entry {
      padding: 6px 14px; font-size: 13px; font-weight: 600;
      background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
      color: #fff; border: none; border-radius: var(--radius-xs);
      cursor: pointer; transition: all 0.2s; white-space: nowrap;
    }
    .news-brief-entry:hover { opacity: 0.9; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(96,165,250,0.3); }

    .news-content-area {
      display: grid;
      grid-template-columns: 1fr 300px;
      gap: 24px;
      align-items: start;
    }
    @media (max-width: 960px) {
      .news-content-area { grid-template-columns: 1fr; }
      .news-right-panel { display: none; }
    }

    .news-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 12px;
    }
    .news-card {
      position: relative;
      padding: 14px 16px;
      background: rgba(30,41,59,0.5);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border: 1px solid rgba(148,163,184,0.1);
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all 0.25s ease;
      animation: fadeIn 0.25s ease forwards;
      opacity: 0;
    }
    .news-card:hover {
      border-color: var(--border-glow); 
      transform: translateY(-3px); 
      box-shadow: 0 8px 32px rgba(96,165,250,0.12), 0 2px 8px rgba(0,0,0,0.2);
    }
    @keyframes fadeIn { from{opacity:0;transform:translateY(6px)} to{opacity:1;transform:translateY(0)} }
    .news-grid .news-card:nth-child(1){animation-delay:0s}
    .news-grid .news-card:nth-child(2){animation-delay:0.03s}
    .news-grid .news-card:nth-child(3){animation-delay:0.06s}
    .news-grid .news-card:nth-child(4){animation-delay:0.09s}
    .news-grid .news-card:nth-child(5){animation-delay:0.12s}
    .news-grid .news-card:nth-child(6){animation-delay:0.15s}
    .news-grid .news-card:nth-child(7){animation-delay:0.18s}
    .news-grid .news-card:nth-child(8){animation-delay:0.21s}
    .news-grid .news-card:nth-child(9){animation-delay:0.24s}
    .news-grid .news-card:nth-child(10){animation-delay:0.27s}
    .news-grid .news-card:nth-child(11){animation-delay:0.3s}
    .news-grid .news-card:nth-child(12){animation-delay:0.33s}
    .news-tags { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 6px; }
    .news-tag {
      font-size: 10px;
      padding: 2px 6px;
      background: var(--accent-glow);
      color: var(--accent);
      border-radius: 4px;
      font-weight: 500;
    }
    .news-title {
      font-family: 'Plus Jakarta Sans', sans-serif;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 4px;
      line-height: 1.4;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }
    .news-original {
      font-size: 11px;
      color: var(--text-muted);
      margin-bottom: 2px;
      font-style: italic;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }
    .news-summary {
      font-size: 12px;
      color: var(--text-secondary);
      line-height: 1.5;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }
    .news-meta-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
    .news-time { font-size: 11px; color: var(--text-muted); }
    .news-source { font-size: 11px; color: var(--text-muted); }
    .news-source a { color: var(--accent); text-decoration: none; }
    .news-source a:hover { text-decoration: underline; }
    .news-source-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 18px;
      height: 18px;
      border-radius: 4px;
      font-size: 10px;
      font-weight: 700;
      margin-right: 4px;
      flex-shrink: 0;
      vertical-align: middle;
    }
    .news-source-icon.src-hn { background: #ff6600; color: #fff; }
    .news-source-icon.src-github { background: #333; color: #fff; }
    .news-source-icon.src-reddit { background: #ff4500; color: #fff; }
    .news-source-icon.src-arxiv { background: #b31b1b; color: #fff; }
    .news-source-icon.src-ph { background: #da552f; color: #fff; }
    .news-source-icon.src-blog { background: #6366f1; color: #fff; }
    .news-card-actions {
      display: flex; gap: 4px; margin-top: 8px;
    }
    .news-card-actions button {
      padding: 3px 8px; font-size: 10px; background: transparent; color: var(--text-muted);
      border: 1px solid transparent; border-radius: var(--radius-xs); cursor: pointer;
      transition: all var(--transition);
    }
    .news-card-actions button:hover { color: var(--accent); border-color: var(--border); }
    .news-card-actions .btn-liked { color: var(--success); border-color: rgba(52,211,153,0.3); }

    /* News right panel: keyword filter + milestones + brief */
    .news-right-panel {
      position: sticky;
      top: calc(var(--header-h) + 20px);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .panel-card {
      background: rgba(30,41,59,0.5);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border: 1px solid rgba(148,163,184,0.1);
      border-radius: var(--radius-sm);
      padding: 16px;
    }
    .panel-card-title {
      font-size: 12px;
      font-weight: 600;
      color: var(--text-muted);
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 12px;
    }
    .keyword-input {
      width: 100%;
      padding: 8px 10px;
      font-size: 13px;
      background: var(--bg-elevated);
      border: 1px solid var(--border);
      border-radius: var(--radius-xs);
      color: var(--text-primary);
      margin-bottom: 8px;
    }
    .keyword-input::placeholder { color: var(--text-muted); }
    .keyword-input:focus { outline: none; border-color: var(--accent); }
    .news-keywords-tags { display: flex; flex-wrap: wrap; gap: 4px; }
    .news-keywords-tags .tag {
      font-size: 11px; padding: 3px 7px; background: var(--bg-elevated); border-radius: 4px; color: var(--text-secondary);
      display: inline-flex; align-items: center; gap: 3px;
    }
    .news-keywords-tags .tag-remove { cursor: pointer; color: var(--text-muted); font-size: 13px; }
    .news-keywords-tags .tag-remove:hover { color: var(--accent); }
    .panel-actions { display: flex; flex-direction: column; gap: 6px; margin-top: 10px; }
    .panel-actions button {
      width: 100%; text-align: left; padding: 7px 10px; font-size: 12px;
      background: var(--bg-elevated); color: var(--text-secondary); border: 1px solid var(--border);
      border-radius: var(--radius-xs); cursor: pointer; transition: all var(--transition);
    }
    .panel-actions button:hover { color: var(--text-primary); border-color: var(--border-hover); }
    .panel-actions .btn-primary {
      background: var(--accent); color: var(--bg-deep); border-color: var(--accent); font-weight: 600; text-align: center;
    }
    .panel-actions .btn-primary:hover { opacity: 0.9; }

    /* Milestones timeline in panel */
    .milestones-list { max-height: 300px; overflow-y: auto; }
    .milestone-item {
      display: flex; gap: 10px; padding: 8px 0; border-bottom: 1px solid rgba(63,63,70,0.4);
      font-size: 12px; align-items: flex-start;
    }
    .milestone-item:last-child { border-bottom: none; }
    .milestone-date { color: var(--accent); font-weight: 600; font-size: 11px; flex-shrink: 0; width: 56px; }
    .milestone-title { font-weight: 500; color: var(--text-primary); }
    .milestone-desc { color: var(--text-muted); font-size: 11px; margin-top: 2px; }


    /* ─── NEWS MODAL ─── */
    #news-modal {
      display: none; position: fixed; inset: 0;
      background: rgba(0,0,0,0.65); z-index: 200;
      align-items: center; justify-content: center; padding: 24px;
    }
    #news-modal.show { display: flex; }
    .news-modal-content {
      background: rgba(24,24,27,0.9); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(148,163,184,0.12);
      border-radius: var(--radius); max-width: 600px; width: 100%;
      max-height: 85vh; overflow-y: auto; padding: 28px; position: relative;
    }
    .news-modal-close {
      position: absolute; top: 12px; right: 12px;
      width: 28px; height: 28px; border: none; background: var(--bg-elevated);
      color: var(--text-secondary); font-size: 18px; cursor: pointer;
      border-radius: var(--radius-xs); display: flex; align-items: center; justify-content: center;
    }
    .news-modal-close:hover { color: var(--text-primary); }
    .news-modal-content h3 { margin: 0 0 8px; padding-right: 36px; font-size: 18px; }
    .news-modal-content .full-text { margin: 12px 0; color: var(--text-secondary); font-size: 14px; line-height: 1.7; }
    .news-original-block { font-size: 12px; color: var(--text-muted); margin-top: 12px; padding-top: 8px; border-top: 1px dashed var(--border); }
    .link-out {
      display: inline-flex; align-items: center; gap: 6px; padding: 8px 16px;
      background: var(--accent); color: var(--bg-deep); border-radius: var(--radius-xs);
      text-decoration: none; font-weight: 600; font-size: 13px; margin-top: 12px;
    }
    .link-out:hover { opacity: 0.9; }

    /* ─── TOOLS PAGE ─── */
    .tools-page { max-width: 1200px; margin: 0 auto; padding: 20px 24px 48px; }
    .tools-page-header {
      margin-bottom: 20px;
    }
    .tools-page-header h2 { font-size: 20px; font-weight: 700; margin-bottom: 4px; }
    .tools-page-header p { font-size: 13px; color: var(--text-secondary); }
    .tools-search-bar {
      display: flex; gap: 12px; margin-bottom: 16px; align-items: center; flex-wrap: wrap;
    }
    .tool-search {
      flex: 1; min-width: 200px; max-width: 400px;
      padding: 10px 14px; font-size: 14px;
      background: var(--bg-card); border: 1px solid var(--border);
      border-radius: var(--radius-sm); color: var(--text-primary);
    }
    .tool-search::placeholder { color: var(--text-muted); }
    .tool-search:focus { outline: none; border-color: var(--accent); }
    .tool-sort {
      padding: 10px 14px; font-size: 13px;
      background: var(--bg-card); border: 1px solid var(--border);
      border-radius: var(--radius-sm); color: var(--text-primary);
    }
    .tools-categories-bar {
      display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px;
    }
    .tools-categories-bar button {
      padding: 5px 12px; font-size: 12px; font-weight: 500;
      background: transparent; color: var(--text-muted);
      border: 1px solid var(--border); border-radius: 999px;
      cursor: pointer; transition: all var(--transition);
    }
    .tools-categories-bar button:hover { color: var(--text-secondary); border-color: var(--border-hover); }
    .tools-categories-bar button.active { background: var(--accent); color: var(--bg-deep); border-color: var(--accent); }

    .tools-content {
      display: grid;
      grid-template-columns: minmax(280px, 340px) 1fr;
      gap: 20px;
      min-height: 400px;
    }
    @media (max-width: 1024px) {
      .tools-content { grid-template-columns: minmax(240px, 300px) 1fr; }
    }
    @media (max-width: 800px) {
      .tools-content { grid-template-columns: 1fr; }
      .tools-page { padding: 12px 12px 48px; }
      .tool-search { min-width: 120px; max-width: none; }
      .tools-search-bar { gap: 8px; }
      .tools-categories-bar { overflow-x: auto; flex-wrap: nowrap; -webkit-overflow-scrolling: touch; scrollbar-width: none; padding-bottom: 4px; }
      .tools-categories-bar::-webkit-scrollbar { display: none; }
      .tools-categories-bar button { flex-shrink: 0; }
    }
    .tool-list-wrap { overflow-y: auto; max-height: 75vh; }
    .tool-card {
      padding: 14px 16px; background: var(--bg-card); border: 1px solid var(--border);
      border-radius: var(--radius-sm); margin-bottom: 8px; cursor: pointer;
      transition: all var(--transition);
    }
    .tool-card:hover, .tool-card.active {
      border-color: var(--accent);
      box-shadow: 0 0 0 1px var(--accent-glow), 0 4px 20px rgba(96,165,250,0.1);
      transform: translateY(-1px);
    }
    .tool-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
    .tool-name { font-family: 'Plus Jakarta Sans', sans-serif; font-size: 15px; font-weight: 600; }
    .tool-stars { font-size: 12px; color: var(--text-muted); white-space: nowrap; }
    .hot-badge { display: inline-flex; align-items: center; gap: 2px; font-size: 11px; font-weight: 600; padding: 2px 7px; border-radius: 10px; line-height: 1.3; }
    .hot-badge.fire { background: linear-gradient(135deg, #ff4500, #ff8c00); color: #fff; animation: hotPulse 2s ease-in-out infinite; }
    .hot-badge.hot { background: linear-gradient(135deg, #ff6b35, #ffa500); color: #fff; }
    .hot-badge.warm { background: rgba(255,165,0,0.15); color: #e69500; }
    @keyframes hotPulse { 0%,100% { box-shadow: 0 0 0 0 rgba(255,69,0,0.3); } 50% { box-shadow: 0 0 8px 2px rgba(255,69,0,0.2); } }
    .tool-tagline { font-size: 12px; color: var(--text-secondary); margin-top: 4px; line-height: 1.4; }
    .tool-tags { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 6px; }
    .tag {
      font-size: 10px; padding: 2px 7px; background: var(--bg-elevated);
      border-radius: 4px; color: var(--text-secondary);
    }
    .tool-detail-panel {
      background: rgba(30,41,59,0.5); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
      border: 1px solid rgba(148,163,184,0.1);
      border-radius: var(--radius-sm); padding: 20px; overflow-y: auto; max-height: 75vh;
      word-break: break-word; overflow-x: hidden;
    }
    .tool-detail-panel.empty-state { color: var(--text-muted); font-size: 13px; display: flex; align-items: center; justify-content: center; }
    .deploy-tabs { display: flex; gap: 4px; margin-bottom: 12px; }
    .deploy-tab {
      padding: 6px 12px; font-size: 12px;
      background: var(--bg-elevated); border: 1px solid var(--border);
      border-radius: var(--radius-xs); color: var(--text-secondary); cursor: pointer;
      transition: all var(--transition);
    }
    .deploy-tab:hover { color: var(--text-primary); border-color: var(--border-hover); }
    .deploy-tab.active { background: var(--accent); color: var(--bg-deep); border-color: var(--accent); }
    .deploy-content { display: none; }
    .deploy-content.active { display: block; }
    pre {
      background: var(--bg-deep); border-radius: var(--radius-xs);
      padding: 14px; overflow-x: auto; font-size: 12px;
      font-family: 'JetBrains Mono', monospace; border: 1px solid var(--border);
    }
    code { font-family: 'JetBrains Mono', monospace; }
    .tool-links { margin-top: 10px; display: flex; gap: 12px; }
    .tool-links a { font-size: 12px; color: var(--accent); text-decoration: none; }
    .tool-links a:hover { text-decoration: underline; }

    /* ─── BRIEF PAGE ─── */
    .brief-page { max-width: 800px; margin: 0 auto; padding: 20px 24px 48px; }
    .brief-page-header { margin-bottom: 24px; }
    .brief-page-header h2 { font-size: 20px; font-weight: 700; margin-bottom: 4px; }
    .brief-page-header p { font-size: 13px; color: var(--text-secondary); }
    .brief-featured {
      border-radius: var(--radius-sm); overflow: hidden; margin-bottom: 24px;
      background: rgba(30,41,59,0.5);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border: 1px solid rgba(148,163,184,0.1);
    }
    .brief-featured-img { width: 100%; height: 200px; object-fit: cover; background: var(--bg-deep); }
    .brief-featured-body { padding: 20px; }
    .brief-featured-title { font-size: 18px; font-weight: 600; margin-bottom: 8px; line-height: 1.4; }
    .brief-featured-title a { color: var(--text-primary); text-decoration: none; }
    .brief-featured-title a:hover { color: var(--accent); }
    .brief-featured-summary { font-size: 13px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 10px; }
    .brief-featured-meta { font-size: 12px; color: var(--text-muted); display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
    .brief-featured-link { font-size: 13px; color: var(--accent); text-decoration: none; }
    .brief-featured-link:hover { text-decoration: underline; }
    .brief-cards {
      display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
      gap: 12px; margin-bottom: 28px; list-style: none; padding: 0;
    }
    .brief-card {
      padding: 16px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm);
      transition: border-color var(--transition);
    }
    .brief-card:hover { border-color: var(--accent); }
    .brief-card-title { font-size: 14px; font-weight: 600; margin-bottom: 6px; line-height: 1.4; }
    .brief-card-title a { color: var(--text-primary); text-decoration: none; }
    .brief-card-title a:hover { color: var(--accent); }
    .brief-card-summary { font-size: 12px; color: var(--text-secondary); line-height: 1.5; margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
    .brief-card-meta { font-size: 11px; color: var(--text-muted); display: flex; justify-content: space-between; }
    .brief-card-link { color: var(--accent); font-size: 11px; text-decoration: none; }
    .brief-card-link:hover { text-decoration: underline; }

    /* ─── RECOMMEND PAGE ─── */
    .rec-container {
      max-width: 900px; margin: 0 auto; padding: 0 20px 60px;
      font-family: 'Plus Jakarta Sans', 'Inter', system-ui, sans-serif;
    }

    @keyframes recFadeIn {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }
    @keyframes recPulse {
      0%, 100% { box-shadow: 0 0 0 0 rgba(96,165,250,0.4); }
      50% { box-shadow: 0 0 0 12px transparent; }
    }
    @keyframes recStagger {
      from { opacity: 0; transform: translateY(12px) scale(0.97); }
      to { opacity: 1; transform: translateY(0) scale(1); }
    }
    @keyframes recMeshFloat {
      0%, 100% { transform: translate(0, 0) rotate(0deg); }
      33% { transform: translate(30px, -20px) rotate(120deg); }
      66% { transform: translate(-20px, 15px) rotate(240deg); }
    }
    @keyframes recGlowPulse {
      0%, 100% { opacity: 0.5; }
      50% { opacity: 1; }
    }
    @keyframes recCopiedCheck {
      0% { transform: scale(0.8); }
      50% { transform: scale(1.15); }
      100% { transform: scale(1); }
    }
    @keyframes recSlideUp {
      from { opacity: 0; transform: translateX(-50%) translateY(20px); }
      to { opacity: 1; transform: translateX(-50%) translateY(0); }
    }

    /* ── Picker Phase ── */
    .rec-picker { animation: recFadeIn 0.5s cubic-bezier(0.22, 1, 0.36, 1); }

    .rec-picker-hero {
      text-align: center; padding: 56px 24px 40px;
      position: relative; overflow: hidden;
      background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(96,165,250,0.15) 0%, transparent 60%),
        radial-gradient(ellipse 60% 40% at 80% 80%, rgba(167,139,250,0.1) 0%, transparent 50%),
        radial-gradient(ellipse 50% 50% at 20% 60%, rgba(34,197,94,0.06) 0%, transparent 50%);
      border-radius: 20px 20px 0 0;
    }
    .rec-picker-hero::before {
      content: ''; position: absolute; inset: 0;
      background: radial-gradient(circle 300px at 70% 30%, rgba(96,165,250,0.08), transparent),
                  radial-gradient(circle 200px at 30% 70%, rgba(167,139,250,0.06), transparent);
      animation: recMeshFloat 20s ease-in-out infinite;
      pointer-events: none;
    }
    .rec-picker-icon {
      margin-bottom: 16px; display: inline-block;
    }
    .rec-picker-hero h2 {
      font-family: 'Plus Jakarta Sans', sans-serif;
      font-size: 36px; font-weight: 800; margin-bottom: 12px; line-height: 1.2;
      background: linear-gradient(135deg, #60A5FA 0%, #a78bfa 40%, #34D399 100%);
      -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
      position: relative;
    }
    .rec-picker-hero p {
      font-size: 16px; color: var(--text-secondary); max-width: 520px;
      margin: 0 auto; line-height: 1.6; position: relative;
    }

    .rec-picker-form {
      background: rgba(30,41,59,0.55);
      backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(148,163,184,0.12);
      border-radius: 0 0 20px 20px;
      padding: 36px 32px 32px;
      box-shadow: 0 8px 32px rgba(0,0,0,0.2), inset 0 1px 0 rgba(255,255,255,0.04);
    }

    .rec-picker-section { margin-bottom: 28px; }
    .rec-picker-section:last-of-type { margin-bottom: 24px; }
    .rec-picker-section label {
      display: block; font-size: 13px; font-weight: 600; margin-bottom: 14px;
      color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.06em;
      font-family: 'Plus Jakarta Sans', sans-serif;
    }

    .rec-breadcrumb {
      display: flex; align-items: center; gap: 6px; margin-bottom: 14px; font-size: 12px; color: var(--text-muted);
      font-family: 'Plus Jakarta Sans', sans-serif;
    }
    .rec-breadcrumb-item { cursor: pointer; color: var(--accent); transition: opacity 0.2s; }
    .rec-breadcrumb-item:hover { opacity: 0.8; }
    .rec-breadcrumb-sep { color: var(--text-muted); }
    .rec-breadcrumb-current { color: var(--text-secondary); font-weight: 600; }

    .rec-picker-section { animation: recFadeIn 0.35s ease; }
    @keyframes recFadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

    /* Profession grid */
    .rec-profession-grid {
      display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px;
    }
    .rec-prof-btn {
      display: flex; align-items: center; gap: 10px; padding: 14px 16px;
      background: rgba(51,65,85,0.4);
      backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
      border: 1.5px solid rgba(148,163,184,0.12);
      border-radius: 12px;
      color: var(--text-secondary); font-size: 13px; font-weight: 500;
      font-family: 'Plus Jakarta Sans', sans-serif;
      cursor: pointer; transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
      animation: recStagger 0.4s cubic-bezier(0.22, 1, 0.36, 1) backwards;
    }
    .rec-prof-btn:nth-child(1) { animation-delay: 0.02s; }
    .rec-prof-btn:nth-child(2) { animation-delay: 0.04s; }
    .rec-prof-btn:nth-child(3) { animation-delay: 0.06s; }
    .rec-prof-btn:nth-child(4) { animation-delay: 0.08s; }
    .rec-prof-btn:nth-child(5) { animation-delay: 0.10s; }
    .rec-prof-btn:nth-child(6) { animation-delay: 0.12s; }
    .rec-prof-btn:nth-child(7) { animation-delay: 0.14s; }
    .rec-prof-btn:nth-child(8) { animation-delay: 0.16s; }
    .rec-prof-btn:nth-child(9) { animation-delay: 0.18s; }
    .rec-prof-btn:nth-child(10) { animation-delay: 0.20s; }
    .rec-prof-btn:nth-child(11) { animation-delay: 0.22s; }
    .rec-prof-btn:nth-child(12) { animation-delay: 0.24s; }
    .rec-prof-btn:nth-child(13) { animation-delay: 0.26s; }
    .rec-prof-btn:nth-child(14) { animation-delay: 0.28s; }
    .rec-prof-btn:nth-child(15) { animation-delay: 0.30s; }

    .rec-prof-btn:hover {
      border-color: rgba(96,165,250,0.4);
      color: var(--text-primary);
      transform: translateY(-2px);
      box-shadow: 0 4px 16px rgba(96,165,250,0.1), 0 0 0 1px rgba(96,165,250,0.1);
      background: rgba(51,65,85,0.6);
    }
    .rec-prof-btn.active {
      border-color: rgba(96,165,250,0.6);
      color: var(--text-primary);
      background: rgba(96,165,250,0.12);
      box-shadow: 0 0 20px rgba(96,165,250,0.15), inset 0 0 20px rgba(96,165,250,0.05);
    }
    .rec-prof-btn .rec-prof-icon {
      font-size: 11px; font-weight: 800; letter-spacing: 0.02em; flex-shrink: 0;
      width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
      background: linear-gradient(135deg, #60A5FA 0%, #a78bfa 100%);
      border-radius: 50%; color: #fff;
      font-family: 'Plus Jakarta Sans', 'Inter', system-ui, sans-serif;
    }
    .rec-prof-btn.active .rec-prof-icon {
      background: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 100%);
      box-shadow: 0 0 12px rgba(96,165,250,0.3);
    }

    /* Icon utility classes */
    .icon { display: inline-flex; vertical-align: middle; width: 1em; height: 1em; align-items: center; justify-content: center; }
    .icon-sm { width: 14px; height: 14px; }
    .icon-md { width: 18px; height: 18px; }
    .icon-lg { width: 24px; height: 24px; }
    .icon svg { width: 100%; height: 100%; }

    /* OS buttons */
    .rec-os-grid, .rec-region-grid { display: flex; gap: 12px; }
    .rec-os-btn {
      flex: 1; display: flex; align-items: center; justify-content: center; gap: 10px;
      padding: 14px 20px;
      background: rgba(51,65,85,0.4);
      backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
      border: 1.5px solid rgba(148,163,184,0.12);
      border-radius: 50px;
      color: var(--text-secondary); font-size: 14px; font-weight: 500;
      font-family: 'Plus Jakarta Sans', sans-serif;
      cursor: pointer; transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
    }
    .rec-os-btn:hover {
      border-color: rgba(96,165,250,0.35); color: var(--text-primary);
      box-shadow: 0 0 16px rgba(96,165,250,0.08);
    }
    .rec-os-btn.active {
      border-color: transparent; color: #fff;
      background: linear-gradient(135deg, #60A5FA 0%, #a78bfa 100%);
      box-shadow: 0 4px 20px rgba(96,165,250,0.3);
    }
    .rec-os-btn .rec-os-icon { font-size: 12px; font-weight: 800; letter-spacing: 0.02em; font-family: 'Plus Jakarta Sans', 'Inter', system-ui, sans-serif; }

    /* Generate button */
    .rec-generate-btn {
      display: flex; align-items: center; justify-content: center; gap: 10px;
      width: 100%; padding: 18px 32px; margin-top: 12px;
      font-size: 17px; font-weight: 700; color: #fff;
      font-family: 'Plus Jakarta Sans', sans-serif;
      background: linear-gradient(135deg, #60A5FA 0%, #22C55E 100%);
      border: none; border-radius: 14px;
      cursor: pointer; transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
      opacity: 0.35; pointer-events: none;
      position: relative; overflow: hidden;
    }
    .rec-generate-btn::before {
      content: ''; position: absolute; inset: 0;
      background: linear-gradient(135deg, rgba(255,255,255,0.12) 0%, transparent 50%);
      pointer-events: none;
    }
    .rec-generate-btn.ready {
      opacity: 1; pointer-events: auto;
      animation: recPulse 2.5s ease-in-out infinite;
      box-shadow: 0 4px 24px rgba(96,165,250,0.25);
    }
    .rec-generate-btn.ready:hover {
      transform: scale(1.02);
      box-shadow: 0 8px 32px rgba(96,165,250,0.4), 0 0 60px rgba(96,165,250,0.15);
    }
    .rec-generate-arrow { font-size: 20px; transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1); }
    .rec-generate-btn.ready:hover .rec-generate-arrow { transform: translateX(6px); }

    /* ── Solution Phase ── */
    .rec-solution { animation: recFadeIn 0.6s cubic-bezier(0.22, 1, 0.36, 1); }

    .rec-sol-hero {
      position: relative; overflow: hidden;
      padding: 48px 36px; margin-bottom: 32px;
      border-radius: 20px;
      background:
        radial-gradient(ellipse 70% 50% at 20% 20%, rgba(96,165,250,0.2) 0%, transparent 60%),
        radial-gradient(ellipse 50% 60% at 80% 80%, rgba(167,139,250,0.15) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 60% 30%, rgba(34,197,94,0.08) 0%, transparent 50%),
        rgba(30,41,59,0.6);
      backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(148,163,184,0.12);
      box-shadow: 0 8px 32px rgba(0,0,0,0.3);
      text-align: center;
    }
    .rec-sol-hero::before {
      content: ''; position: absolute; inset: 0;
      background:
        radial-gradient(circle 250px at 30% 40%, rgba(96,165,250,0.1), transparent),
        radial-gradient(circle 180px at 70% 60%, rgba(167,139,250,0.08), transparent),
        radial-gradient(circle 150px at 50% 20%, rgba(34,211,153,0.06), transparent);
      animation: recMeshFloat 15s ease-in-out infinite;
      pointer-events: none;
    }
    .rec-sol-hero::after {
      content: ''; position: absolute; inset: 0;
      background: linear-gradient(180deg, transparent 60%, rgba(15,23,42,0.4) 100%);
      pointer-events: none;
    }
    .rec-sol-hero h2 {
      font-family: 'Plus Jakarta Sans', sans-serif;
      font-size: 32px; font-weight: 800; margin-bottom: 8px; line-height: 1.25;
      background: linear-gradient(135deg, #F8FAFC 0%, #60A5FA 60%, #a78bfa 100%);
      -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
      position: relative; z-index: 1;
    }
    .rec-sol-hero p {
      font-size: 15px; color: rgba(148,163,184,0.9); position: relative; z-index: 1;
      max-width: 500px; margin: 0 auto; line-height: 1.6;
    }

    .rec-back-btn {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 10px 18px; font-size: 13px; font-weight: 600;
      font-family: 'Plus Jakarta Sans', sans-serif;
      color: var(--text-secondary);
      background: rgba(51,65,85,0.4);
      backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
      border: 1px solid rgba(148,163,184,0.12);
      border-radius: 50px;
      cursor: pointer; transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
      margin-bottom: 24px;
    }
    .rec-back-btn:hover {
      color: var(--text-primary);
      border-color: rgba(96,165,250,0.3);
      box-shadow: 0 0 12px rgba(96,165,250,0.1);
      transform: translateX(-2px);
    }

    .rec-overview {
      background: rgba(30,41,59,0.5);
      backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(148,163,184,0.1);
      border-radius: 16px;
      padding: 24px 28px; margin-bottom: 32px;
      font-size: 14px; color: var(--text-secondary); line-height: 1.8;
      border-left: 4px solid var(--accent);
      box-shadow: 0 4px 24px rgba(0,0,0,0.15);
    }

    /* ── Tool Cards ── */
    .rec-tool-card {
      background: rgba(30,41,59,0.5);
      backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(148,163,184,0.1);
      border-radius: 16px;
      margin-bottom: 20px; overflow: hidden;
      transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
      border-left: 4px solid var(--accent);
      box-shadow: 0 2px 12px rgba(0,0,0,0.1);
      animation: recStagger 0.5s cubic-bezier(0.22, 1, 0.36, 1) backwards;
    }
    .rec-tool-card:nth-child(1) { --tc-accent: #60A5FA; animation-delay: 0.05s; }
    .rec-tool-card:nth-child(2) { --tc-accent: #a78bfa; animation-delay: 0.12s; }
    .rec-tool-card:nth-child(3) { --tc-accent: #34D399; animation-delay: 0.19s; }
    .rec-tool-card:nth-child(4) { --tc-accent: #FBBF24; animation-delay: 0.26s; }
    .rec-tool-card:nth-child(5) { --tc-accent: #F87171; animation-delay: 0.33s; }
    .rec-tool-card:nth-child(6) { --tc-accent: #38BDF8; animation-delay: 0.40s; }
    .rec-tool-card[data-idx="0"] { border-left-color: #60A5FA; }
    .rec-tool-card[data-idx="1"] { border-left-color: #a78bfa; }
    .rec-tool-card[data-idx="2"] { border-left-color: #34D399; }
    .rec-tool-card[data-idx="3"] { border-left-color: #FBBF24; }
    .rec-tool-card[data-idx="4"] { border-left-color: #F87171; }
    .rec-tool-card[data-idx="5"] { border-left-color: #38BDF8; }

    .rec-tool-card:hover {
      border-color: rgba(148,163,184,0.2);
      box-shadow: 0 8px 32px rgba(0,0,0,0.2), 0 0 0 1px rgba(96,165,250,0.08);
      transform: translateY(-2px);
    }
    .rec-tool-card:hover { border-left-width: 4px; }
    .rec-tool-card[data-idx="0"]:hover { border-left-color: #60A5FA; }
    .rec-tool-card[data-idx="1"]:hover { border-left-color: #a78bfa; }
    .rec-tool-card[data-idx="2"]:hover { border-left-color: #34D399; }
    .rec-tool-card[data-idx="3"]:hover { border-left-color: #FBBF24; }
    .rec-tool-card[data-idx="4"]:hover { border-left-color: #F87171; }
    .rec-tool-card[data-idx="5"]:hover { border-left-color: #38BDF8; }

    .rec-tool-header {
      display: flex; align-items: center; gap: 16px;
      padding: 22px 28px; cursor: pointer;
      transition: background 0.2s;
    }
    .rec-tool-header:hover { background: rgba(148,163,184,0.03); }

    .rec-tool-avatar {
      width: 48px; height: 48px; border-radius: 14px; display: flex;
      align-items: center; justify-content: center; font-size: 20px; font-weight: 800;
      flex-shrink: 0; color: #fff; position: relative;
      font-family: 'Plus Jakarta Sans', sans-serif;
    }
    .rec-tool-card[data-idx="0"] .rec-tool-avatar { background: linear-gradient(135deg, #60A5FA, #3B82F6); }
    .rec-tool-card[data-idx="1"] .rec-tool-avatar { background: linear-gradient(135deg, #a78bfa, #8B5CF6); }
    .rec-tool-card[data-idx="2"] .rec-tool-avatar { background: linear-gradient(135deg, #34D399, #10B981); }
    .rec-tool-card[data-idx="3"] .rec-tool-avatar { background: linear-gradient(135deg, #FBBF24, #F59E0B); }
    .rec-tool-card[data-idx="4"] .rec-tool-avatar { background: linear-gradient(135deg, #F87171, #EF4444); }
    .rec-tool-card[data-idx="5"] .rec-tool-avatar { background: linear-gradient(135deg, #38BDF8, #0EA5E9); }

    .rec-tool-info { flex: 1; min-width: 0; }
    .rec-tool-name {
      font-family: 'Plus Jakarta Sans', sans-serif;
      font-size: 17px; font-weight: 700; margin-bottom: 4px; display: flex; align-items: center; gap: 8px;
    }
    .rec-tool-role {
      display: inline-flex; align-items: center; gap: 4px;
      font-size: 11px; font-weight: 600; color: var(--accent);
      background: rgba(96,165,250,0.1);
      padding: 3px 10px; border-radius: 20px;
      border: 1px solid rgba(96,165,250,0.15);
    }
    .rec-tool-toggle {
      width: 32px; height: 32px; display: flex; align-items: center; justify-content: center;
      font-size: 14px; color: var(--text-muted);
      background: rgba(148,163,184,0.08); border-radius: 8px;
      transition: all 0.35s cubic-bezier(0.22, 1, 0.36, 1); flex-shrink: 0;
    }
    .rec-tool-toggle:hover { background: rgba(148,163,184,0.15); }
    .rec-tool-toggle.open { transform: rotate(180deg); background: rgba(96,165,250,0.12); color: var(--accent); }

    .rec-tool-body {
      max-height: 0; overflow: hidden;
      transition: max-height 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    }
    .rec-tool-body.open { max-height: 5000px; }
    .rec-tool-inner { padding: 0 28px 28px; }

    .rec-why {
      font-size: 13px; color: var(--text-secondary); line-height: 1.7;
      padding: 16px 20px;
      background: rgba(51,65,85,0.3);
      backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
      border-radius: 12px;
      margin-bottom: 24px;
      border-left: 3px solid var(--accent-secondary);
      box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
    }

    /* Sections inside tool */
    .rec-section-title {
      font-family: 'Plus Jakarta Sans', sans-serif;
      font-size: 12px; font-weight: 700; color: var(--text-muted);
      text-transform: uppercase; letter-spacing: 0.08em;
      margin-bottom: 16px; display: flex; align-items: center; gap: 8px;
    }

    /* Scenarios */
    .rec-scenario {
      background: rgba(51,65,85,0.25);
      backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
      border: 1px solid rgba(148,163,184,0.08);
      border-radius: 14px;
      padding: 20px; margin-bottom: 16px;
      transition: border-color 0.2s;
    }
    .rec-scenario:hover { border-color: rgba(148,163,184,0.15); }
    .rec-scenario-title {
      font-family: 'Plus Jakarta Sans', sans-serif;
      font-size: 15px; font-weight: 600; margin-bottom: 14px;
      color: var(--text-primary);
    }

    .rec-ba-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 16px; }
    .rec-ba-card {
      padding: 14px 16px; border-radius: 12px; font-size: 13px; line-height: 1.6;
      position: relative; transition: transform 0.2s;
    }
    .rec-ba-card:hover { transform: translateY(-1px); }
    .rec-ba-before {
      background: rgba(248,113,113,0.06);
      border: 1px solid rgba(248,113,113,0.15);
      border-left: 4px solid #F87171;
    }
    .rec-ba-after {
      background: rgba(52,211,153,0.06);
      border: 1px solid rgba(52,211,153,0.15);
      border-left: 4px solid #34D399;
    }
    .rec-ba-label {
      display: inline-flex; align-items: center; gap: 5px;
      font-size: 11px; font-weight: 700; text-transform: uppercase; margin-bottom: 8px;
      padding: 2px 8px; border-radius: 6px;
    }
    .rec-ba-before .rec-ba-label {
      color: #F87171;
      background: rgba(248,113,113,0.1);
    }
    .rec-ba-after .rec-ba-label {
      color: #34D399;
      background: rgba(52,211,153,0.1);
    }

    /* Prompt block */
    .rec-prompt-block {
      position: relative;
      background: #0F172A;
      border: 1px solid rgba(148,163,184,0.1);
      border-radius: 12px;
      padding: 16px 52px 16px 18px;
      font-size: 12.5px; line-height: 1.7; color: var(--text-secondary);
      font-family: 'JetBrains Mono', 'Fira Code', monospace;
      white-space: pre-wrap; word-break: break-all;
      box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
    }
    .rec-copy-btn {
      position: absolute; top: 10px; right: 10px;
      padding: 5px 12px; font-size: 11px; font-weight: 600;
      color: var(--text-muted);
      background: rgba(51,65,85,0.6);
      backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
      border: 1px solid rgba(148,163,184,0.15);
      border-radius: 20px;
      cursor: pointer; transition: all 0.2s;
      font-family: 'Plus Jakarta Sans', sans-serif;
    }
    .rec-copy-btn:hover {
      color: var(--text-primary);
      border-color: var(--accent);
      background: rgba(96,165,250,0.12);
      box-shadow: 0 0 12px rgba(96,165,250,0.1);
    }
    .rec-copy-btn.copied {
      color: #34D399;
      border-color: #34D399;
      background: rgba(52,211,153,0.12);
      animation: recCopiedCheck 0.3s ease;
    }

    /* Install timeline */
    .rec-install-header {
      display: flex; align-items: center; justify-content: space-between;
      margin-bottom: 16px;
    }
    .rec-install-meta {
      display: flex; gap: 14px; font-size: 12px; color: var(--text-muted);
    }
    .rec-install-meta span {
      display: flex; align-items: center; gap: 5px;
      background: rgba(148,163,184,0.06); padding: 3px 10px; border-radius: 20px;
    }

    .rec-timeline { position: relative; padding-left: 36px; }
    .rec-timeline::before {
      content: ''; position: absolute; left: 14px; top: 12px; bottom: 12px;
      width: 2px;
      background: linear-gradient(180deg, #60A5FA 0%, #34D399 100%);
      border-radius: 2px;
      opacity: 0.6;
    }
    .rec-step {
      position: relative; margin-bottom: 20px; padding: 18px 20px;
      background: rgba(51,65,85,0.3);
      backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
      border: 1px solid rgba(148,163,184,0.08);
      border-radius: 14px;
      transition: all 0.2s;
    }
    .rec-step:hover { border-color: rgba(148,163,184,0.15); transform: translateX(2px); }
    .rec-step:last-child { margin-bottom: 0; }
    .rec-step-num {
      position: absolute; left: -36px; top: 18px;
      width: 28px; height: 28px; border-radius: 50%;
      background: linear-gradient(135deg, #60A5FA, #3B82F6);
      color: #fff; font-size: 12px; font-weight: 700;
      font-family: 'Plus Jakarta Sans', sans-serif;
      display: flex; align-items: center; justify-content: center;
      box-shadow: 0 0 12px rgba(96,165,250,0.3), 0 0 0 3px rgba(96,165,250,0.1);
      animation: recGlowPulse 3s ease-in-out infinite;
    }
    .rec-step-title {
      font-family: 'Plus Jakarta Sans', sans-serif;
      font-size: 14px; font-weight: 600; margin-bottom: 6px; color: var(--text-primary);
    }
    .rec-step-detail {
      font-size: 12.5px; color: var(--text-secondary); line-height: 1.6;
    }
    .rec-step-tip {
      margin-top: 10px; font-size: 12px; color: var(--warning);
      display: flex; align-items: flex-start; gap: 6px;
      background: rgba(251,191,36,0.06); padding: 8px 12px; border-radius: 8px;
      border: 1px solid rgba(251,191,36,0.1);
    }

    /* Workflow */
    .rec-quickstart {
      background: linear-gradient(135deg, rgba(96,165,250,0.12), rgba(52,211,153,0.10));
      border: 2px solid rgba(96,165,250,0.25);
      border-radius: 16px; padding: 28px; margin-bottom: 28px; position: relative; overflow: hidden;
    }
    .rec-quickstart::before {
      content: ''; position: absolute; right: -30px; top: -30px; width: 120px; height: 120px;
      background: radial-gradient(circle, rgba(96,165,250,0.15), transparent 70%);
      border-radius: 50%;
    }
    .rec-quickstart h3 {
      font-family: 'Plus Jakarta Sans', sans-serif;
      font-size: 18px; font-weight: 700; margin-bottom: 6px; color: var(--text-primary);
    }
    .rec-quickstart-sub { font-size: 13px; color: var(--text-secondary); margin-bottom: 18px; }
    .rec-quickstart-steps { display: flex; flex-direction: column; gap: 0; position: relative; padding-left: 28px; }
    .rec-quickstart-steps::before {
      content: ''; position: absolute; left: 11px; top: 14px; bottom: 14px; width: 2px;
      background: linear-gradient(180deg, #60A5FA, #34D399); border-radius: 2px;
    }
    .rec-qs-step {
      position: relative; padding: 10px 0;
    }
    .rec-qs-step::before {
      content: ''; position: absolute; left: -21px; top: 16px; width: 10px; height: 10px;
      border-radius: 50%; background: #60A5FA; border: 2px solid var(--bg-deep);
      box-shadow: 0 0 8px rgba(96,165,250,0.4);
    }
    .rec-qs-step:last-child::before { background: #34D399; box-shadow: 0 0 8px rgba(52,211,153,0.4); }
    .rec-qs-time { font-size: 11px; color: var(--accent); font-weight: 600; letter-spacing: 0.5px; text-transform: uppercase; }
    .rec-qs-action { font-size: 14px; color: var(--text-primary); font-weight: 600; margin: 2px 0; }
    .rec-qs-detail { font-size: 12.5px; color: var(--text-secondary); line-height: 1.6; }
    .rec-qs-tool-tag {
      display: inline-block; background: rgba(96,165,250,0.15); color: #60A5FA;
      font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 10px; margin-top: 4px;
    }
    .rec-workflow {
      background: rgba(30,41,59,0.5);
      backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(148,163,184,0.1);
      border-radius: 16px;
      padding: 28px; margin-top: 32px;
      position: relative; overflow: hidden;
    }
    .rec-workflow::before {
      content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
      background: linear-gradient(180deg, #60A5FA, #34D399);
      border-radius: 4px 0 0 4px;
    }
    .rec-workflow h3 {
      font-family: 'Plus Jakarta Sans', sans-serif;
      font-size: 18px; font-weight: 700; margin-bottom: 20px;
      color: var(--text-primary);
    }
    .rec-workflow-content {
      font-size: 13.5px; color: var(--text-secondary); line-height: 1.9;
      padding: 20px;
      background: rgba(51,65,85,0.25);
      border-radius: 12px;
      border: 1px solid rgba(148,163,184,0.06);
    }

    /* Action footer */
    .rec-action-footer {
      text-align: center; margin-top: 40px; padding: 32px;
      background: rgba(30,41,59,0.5);
      backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(148,163,184,0.1);
      border-radius: 16px;
      position: relative; overflow: hidden;
    }
    .rec-action-footer::before {
      content: ''; position: absolute; top: 0; left: 20%; right: 20%; height: 1px;
      background: linear-gradient(90deg, transparent, rgba(96,165,250,0.3), transparent);
    }
    .rec-action-footer p {
      font-size: 15px; color: var(--text-secondary); margin-bottom: 16px;
      font-family: 'Plus Jakarta Sans', sans-serif;
    }
    .rec-action-footer button {
      padding: 12px 28px; font-size: 14px; font-weight: 600;
      font-family: 'Plus Jakarta Sans', sans-serif;
      background: linear-gradient(135deg, #60A5FA 0%, #22C55E 100%);
      color: #fff; border: none;
      border-radius: 12px; cursor: pointer;
      transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
      box-shadow: 0 2px 12px rgba(96,165,250,0.2);
    }
    .rec-action-footer button:hover {
      transform: translateY(-2px) scale(1.02);
      box-shadow: 0 8px 24px rgba(96,165,250,0.35);
    }

    /* Toast */
    .rec-toast {
      position: fixed; bottom: 32px; left: 50%;
      transform: translateX(-50%) translateY(20px);
      padding: 14px 28px;
      background: rgba(30,41,59,0.85);
      backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
      color: #34D399;
      border: 1px solid rgba(52,211,153,0.3);
      border-radius: 50px;
      font-size: 14px; font-weight: 600;
      font-family: 'Plus Jakarta Sans', sans-serif;
      opacity: 0; transition: all 0.35s cubic-bezier(0.22, 1, 0.36, 1);
      z-index: 999; pointer-events: none;
      box-shadow: 0 8px 32px rgba(0,0,0,0.3), 0 0 20px rgba(52,211,153,0.1);
    }
    .rec-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

    @media (max-width: 640px) {
      .rec-profession-grid { grid-template-columns: repeat(2, 1fr); }
      .rec-os-grid, .rec-region-grid { flex-direction: column; }
      .rec-ba-row { grid-template-columns: 1fr; }
      .rec-sol-hero { padding: 32px 20px; }
      .rec-sol-hero h2 { font-size: 24px; }
      .rec-picker-hero h2 { font-size: 28px; }
      .rec-picker-hero { padding: 40px 16px 28px; }
      .rec-picker-form { padding: 28px 20px 24px; }
      .rec-tool-header { padding: 18px 20px; }
      .rec-tool-inner { padding: 0 20px 20px; }
      .rec-tool-avatar { width: 42px; height: 42px; border-radius: 12px; }
      .rec-overview { padding: 20px 22px; }
      .rec-workflow { padding: 22px; }
      .rec-action-footer { padding: 24px 20px; }
    }
    @media (max-width: 480px) {
      .rec-profession-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
      .rec-ba-row { grid-template-columns: 1fr; gap: 10px; }
      .rec-picker-hero h2 { font-size: 24px; }
      .rec-sol-hero h2 { font-size: 20px; }
    }

    /* collection modal styles removed - using slide panel now */
    .link { color: var(--accent); text-decoration: none; }
    .link:hover { text-decoration: underline; }
    .news-badge { display: none; }

    /* Skeleton */
    @keyframes shimmer { 0%{background-position:-200% 0} 100%{background-position:200% 0} }
    .skeleton {
      background: linear-gradient(90deg, var(--bg-elevated) 25%, var(--border) 50%, var(--bg-elevated) 75%);
      background-size: 200% 100%; animation: shimmer 1.5s infinite; border-radius: var(--radius-sm);
    }
    .skeleton-card { height: 110px; margin-bottom: 10px; }

    /* ─── FOOTER ─── */
    .site-footer {
      text-align: center; padding: 28px 0 20px; font-size: 12px; color: var(--text-muted);
      border-top: 1px solid rgba(148,163,184,0.1); margin: 0 24px;
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
    }
    .site-footer .brand {
      font-family: 'Plus Jakarta Sans', sans-serif;
      background: var(--gradient-accent); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
      font-weight: 700;
    }

    /* ─── GUIDE BANNER ─── */
    .guide-banner {
      background: var(--gradient-accent);
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      position: relative;
    }
    .guide-banner-text { flex: 1; }
    .guide-banner-text strong { display: block; font-size: 15px; color: #fff; margin-bottom: 2px; }
    .guide-banner-text span { font-size: 13px; color: rgba(255,255,255,0.85); }
    .guide-banner button.guide-banner-cta {
      padding: 8px 18px; font-size: 13px; font-weight: 600;
      background: #fff; color: var(--bg-deep); border: none;
      border-radius: var(--radius-xs); cursor: pointer; white-space: nowrap;
      transition: opacity var(--transition);
    }
    .guide-banner button.guide-banner-cta:hover { opacity: 0.9; }
    .guide-banner-close {
      position: absolute; top: 6px; right: 8px;
      background: none; border: none; color: rgba(255,255,255,0.7);
      font-size: 18px; cursor: pointer; line-height: 1; padding: 2px 4px;
    }
    .guide-banner-close:hover { color: #fff; }

    /* ─── DIFFICULTY BADGES ─── */
    .difficulty-badge {
      display: inline-block; font-size: 11px; font-weight: 600;
      padding: 2px 8px; border-radius: 999px; color: #fff; line-height: 1.5;
    }
    .difficulty-badge.d-入门 { background: #34d399; }
    .difficulty-badge.d-简单 { background: #60a5fa; }
    .difficulty-badge.d-中等 { background: #fbbf24; color: #1a1a1a; }
    .difficulty-badge.d-进阶 { background: #f87171; }

    /* ─── AUDIENCE TAGS ─── */
    .audience-tag {
      display: inline-block; font-size: 10px;
      padding: 2px 7px; border-radius: 999px;
      background: var(--bg-elevated); color: var(--text-secondary);
      border: 1px solid var(--border); line-height: 1.5;
    }

    /* ─── COPY BUTTON on pre blocks ─── */
    .pre-wrapper {
      position: relative;
    }
    .btn-copy-code {
      position: absolute; top: 6px; right: 6px;
      padding: 3px 10px; font-size: 11px;
      background: var(--bg-elevated); color: var(--text-secondary);
      border: 1px solid var(--border); border-radius: var(--radius-xs);
      cursor: pointer; transition: all var(--transition); z-index: 2;
    }
    .btn-copy-code:hover { color: var(--text-primary); border-color: var(--border-hover); }
    .btn-copy-code.copied { color: var(--success); border-color: rgba(52,211,153,0.4); }

    /* ─── TOOL DETAIL LINKS ─── */
    .tool-detail-links { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--border); }
    .tool-detail-links a {
      font-size: 12px; color: var(--accent); text-decoration: none;
      display: inline-flex; align-items: center; gap: 4px;
    }
    .tool-detail-links a:hover { text-decoration: underline; }

    /* ─── EMAIL CTA ─── */
    .email-cta {
      background: rgba(30,41,59,0.5); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
      border: 1px solid rgba(148,163,184,0.1);
      border-radius: var(--radius-sm); padding: 24px; text-align: center; margin-top: 24px;
    }
    .email-cta h4 { font-size: 15px; margin: 0 0 6px; font-weight: 600; }
    .email-cta p { font-size: 13px; color: var(--text-secondary); margin: 0 0 14px; }
    .email-form { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
    .email-form input {
      padding: 9px 14px; font-size: 13px; min-width: 220px;
      background: var(--bg-elevated); border: 1px solid var(--border);
      border-radius: var(--radius-xs); color: var(--text-primary);
    }
    .email-form input::placeholder { color: var(--text-muted); }
    .email-form input:focus { outline: none; border-color: var(--accent); }
    .email-form button {
      padding: 9px 18px; font-size: 13px; font-weight: 600;
      background: var(--accent); color: var(--bg-deep); border: none;
      border-radius: var(--radius-xs); cursor: pointer;
    }
    .email-form button:hover { opacity: 0.9; }
    .email-form button.subscribed { background: var(--success); pointer-events: none; }

    /* (recommend cards moved to .rec-tool-card above) */

    @media (max-width: 640px) {
      .site-header {
        position: fixed; bottom: 0; top: auto; left: 0; right: 0; width: 100%;
        border-bottom: none; border-top: 1px solid var(--border);
        z-index: 500; padding: 0; gap: 0;
        justify-content: stretch;
      }
      .site-logo { display: none; }
      .site-nav { display: flex; justify-content: space-around; width: 100%; flex: 1; gap: 0; }
      .site-nav a { font-size: 11px; padding: 10px 4px; white-space: nowrap; text-align: center; flex: 1; min-width: 0; }
      .site-nav a.nav-recommend-highlight:not(.active) { font-size: 11px; background: none; box-shadow: none; animation: none; color: #ff8c00 !important; }
      .site-nav a::after { display: none; }
      .header-right { display: none; }
      body { padding-bottom: var(--header-h); }
      .page.active { padding-top: 0; }
      .home-card-featured { grid-column: auto; }
      .home-card-badge { font-size: 10px; top: 8px; right: 8px; }
    }

    /* Hide legacy elements */
    .news-sidebar { display: none !important; }
    .news-brief-content { display: none; }
    .news-brief-toggle { display: none; }
    .news-filter { display: none; }
    .news-restore-hide { display: none; }
    #news-my-collection { display: none; }

    /* ─── DAILY REPORT (AI 日报) ─── */
    .daily-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; margin-bottom: 20px; flex-wrap: wrap; }
    .daily-header-left { flex: 1; }
    .daily-date { font-size: 13px; color: var(--accent); font-weight: 600; margin-bottom: 4px; letter-spacing: 0.02em; }
    .daily-header h2 { font-size: 28px; font-weight: 800; margin-bottom: 4px; letter-spacing: -0.03em; font-family: 'Plus Jakarta Sans', sans-serif; }
    .daily-subtitle { font-size: 14px; color: var(--text-secondary); }
    .daily-header-right { flex-shrink: 0; }
    .daily-subscribe-mini { display: flex; align-items: center; gap: 10px; padding: 10px 16px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); }
    .daily-subscribe-mini span { font-size: 13px; color: var(--text-secondary); }
    .daily-subscribe-mini button { padding: 6px 14px; font-size: 12px; font-weight: 600; background: var(--accent); color: var(--bg-deep); border: none; border-radius: var(--radius-xs); cursor: pointer; }
    .daily-subscribe-mini button:hover { opacity: 0.9; }

    .daily-overview {
      display: flex; gap: 12px; flex-wrap: wrap; align-items: center;
      padding: 14px 20px; margin-bottom: 20px;
      background: rgba(30,41,59,0.5); border: 1px solid rgba(148,163,184,0.1);
      border-radius: var(--radius-sm);
    }
    .daily-overview-stat { font-size: 13px; color: var(--text-secondary); }
    .daily-overview-stat strong { color: var(--accent); font-weight: 700; }
    .daily-overview-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-left: auto; }
    .daily-overview-tag {
      font-size: 11px; padding: 3px 10px; border-radius: 999px; font-weight: 600;
      background: var(--bg-elevated); color: var(--text-secondary); border: 1px solid var(--border);
      cursor: pointer; transition: all 0.2s;
    }
    .daily-overview-tag:hover, .daily-overview-tag.active { background: var(--accent); color: var(--bg-deep); border-color: var(--accent); }

    .daily-hero {
      background: linear-gradient(135deg, rgba(59,130,246,0.12) 0%, rgba(139,92,246,0.08) 100%);
      border: 1px solid rgba(96,165,250,0.2);
      border-radius: var(--radius); padding: 24px; margin-bottom: 20px;
      position: relative; overflow: hidden;
    }
    .daily-hero-badge { display: inline-block; font-size: 11px; font-weight: 600; padding: 3px 10px; background: var(--accent); color: var(--bg-deep); border-radius: 999px; margin-bottom: 10px; }
    .daily-hero h3 { font-size: 18px; font-weight: 700; line-height: 1.4; margin-bottom: 6px; }
    .daily-hero h3 a { color: var(--text-primary); text-decoration: none; }
    .daily-hero h3 a:hover { color: var(--accent); }
    .daily-hero-summary { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 10px; }
    .daily-hero-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 10px; }
    .daily-hero-tags span { font-size: 10px; padding: 2px 8px; border-radius: 999px; background: rgba(96,165,250,0.15); color: var(--accent); }
    .daily-hero-meta { display: flex; gap: 12px; align-items: center; font-size: 12px; color: var(--text-muted); }
    .daily-hero-meta a { color: var(--accent); text-decoration: none; font-weight: 500; }
    .daily-hero-meta a:hover { text-decoration: underline; }

    .daily-section { margin-bottom: 24px; }
    .daily-section-title {
      display: flex; align-items: center; gap: 8px;
      font-size: 15px; font-weight: 700; color: var(--text-primary);
      margin-bottom: 12px; padding-bottom: 8px; border-bottom: 1px solid var(--border);
    }
    .daily-section-title .section-badge {
      font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 999px;
      background: var(--accent); color: var(--bg-deep);
    }
    .daily-section-title .section-count { font-size: 12px; color: var(--text-muted); font-weight: 400; margin-left: auto; }

    .daily-item {
      display: flex; gap: 14px; padding: 14px 0; border-bottom: 1px solid rgba(63,63,70,0.3);
      transition: background 0.15s;
    }
    .daily-item:last-child { border-bottom: none; }
    .daily-item:hover { background: rgba(30,41,59,0.3); margin: 0 -12px; padding: 14px 12px; border-radius: var(--radius-xs); }
    .daily-item-rank {
      flex-shrink: 0; width: 28px; height: 28px; border-radius: 8px;
      display: flex; align-items: center; justify-content: center;
      font-size: 12px; font-weight: 700; background: var(--bg-elevated); color: var(--text-muted);
    }
    .daily-item-rank.top3 { background: var(--accent); color: var(--bg-deep); }
    .daily-item-body { flex: 1; min-width: 0; }
    .daily-item-title { font-size: 14px; font-weight: 600; line-height: 1.4; margin-bottom: 4px; }
    .daily-item-title a { color: var(--text-primary); text-decoration: none; }
    .daily-item-title a:hover { color: var(--accent); }
    .daily-item-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.5; margin-bottom: 6px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
    .daily-item-meta { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
    .daily-item-source { font-size: 11px; color: var(--text-muted); }
    .daily-item-tags { display: flex; gap: 4px; flex-wrap: wrap; }
    .daily-item-tags span { font-size: 10px; padding: 1px 6px; border-radius: 4px; background: var(--bg-elevated); color: var(--text-muted); }
    .daily-item-link { font-size: 11px; color: var(--accent); text-decoration: none; margin-left: auto; white-space: nowrap; }
    .daily-item-link:hover { text-decoration: underline; }

    .daily-grid { display: none; }

    .daily-subscribe-section { margin-bottom: 32px; }
    .daily-subscribe-card {
      text-align: center;
      padding: 48px 32px;
      background: rgba(30,41,59,0.6);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(96,165,250,0.15);
      border-radius: var(--radius);
      position: relative;
      overflow: hidden;
    }
    .daily-subscribe-card::before {
      content: '';
      position: absolute;
      top: -50%;
      left: -50%;
      width: 200%;
      height: 200%;
      background: radial-gradient(circle at 30% 50%, rgba(96,165,250,0.08) 0%, transparent 50%),
                  radial-gradient(circle at 70% 50%, rgba(167,139,250,0.06) 0%, transparent 50%);
      animation: subtleFloat 15s ease-in-out infinite;
      pointer-events: none;
    }
    @keyframes subtleFloat {
      0%, 100% { transform: translate(0, 0); }
      50% { transform: translate(-2%, 2%); }
    }
    .daily-subscribe-icon { margin-bottom: 12px; color: var(--accent); }
    .daily-subscribe-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 6px; }
    .daily-subscribe-card > p { font-size: 14px; color: var(--text-secondary); margin-bottom: 20px; line-height: 1.5; }
    .daily-subscribe-form { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-bottom: 12px; }
    .daily-subscribe-form input {
      padding: 12px 16px; font-size: 14px; min-width: 260px;
      background: var(--bg-card); border: 1px solid var(--border);
      border-radius: var(--radius-sm); color: var(--text-primary);
    }
    .daily-subscribe-form input::placeholder { color: var(--text-muted); }
    .daily-subscribe-form input:focus { outline: none; border-color: var(--accent); }
    .daily-subscribe-form button {
      padding: 12px 28px; font-size: 14px; font-weight: 700;
      background: var(--accent); color: var(--bg-deep); border: none;
      border-radius: var(--radius-sm); cursor: pointer; transition: all 0.2s;
    }
    .daily-subscribe-form button:hover { opacity: 0.9; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(96,165,250,0.3); }
    .daily-subscribe-form button.subscribed { background: var(--success); pointer-events: none; }
    .daily-subscribe-trust { font-size: 12px; color: var(--text-muted); }
    @keyframes countUp {
      from { opacity: 0; transform: translateY(8px); }
      to { opacity: 1; transform: translateY(0); }
    }
    .daily-subscribe-trust strong {
      display: inline-block;
      animation: countUp 0.5s ease forwards;
      color: var(--accent);
      font-weight: 700;
    }

    h2, h3 {
      font-family: 'Plus Jakarta Sans', sans-serif;
    }
    button {
      font-family: 'Plus Jakarta Sans', sans-serif;
      cursor: pointer;
    }
    .tools-page-header h2, .daily-header h2, .brief-page-header h2 {
      font-family: 'Plus Jakarta Sans', sans-serif;
    }

    /* ─── COLLECTION SLIDE PANEL ─── */
    .collection-slide { position: fixed; top: 0; right: -420px; width: 400px; max-width: 90vw; height: 100vh; z-index: 350; background: var(--bg-card); border-left: 1px solid var(--border); display: flex; flex-direction: column; transition: right 0.3s ease; box-shadow: -8px 0 32px rgba(0,0,0,0.4); }
    .collection-slide.open { right: 0; }
    .collection-slide-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 340; display: none; }
    .collection-slide-overlay.open { display: block; }
    .collection-slide-header { display: flex; align-items: center; justify-content: space-between; padding: 20px; border-bottom: 1px solid var(--border); }
    .collection-slide-header h3 { font-size: 18px; font-weight: 700; display: flex; align-items: center; gap: 8px; }
    .collection-slide-header .badge { font-size: 11px; padding: 2px 8px; background: var(--accent); color: var(--bg-deep); border-radius: 999px; font-weight: 600; }
    .collection-slide-close { width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; border: 1px solid var(--border); border-radius: var(--radius-xs); background: transparent; color: var(--text-secondary); cursor: pointer; font-size: 16px; }
    .collection-slide-close:hover { color: var(--text-primary); border-color: var(--border-hover); }
    .collection-slide-body { flex: 1; overflow-y: auto; padding: 12px 20px; }
    .collection-slide-empty { text-align: center; padding: 48px 20px; color: var(--text-muted); }
    .collection-slide-empty p { font-size: 14px; margin-bottom: 4px; }
    .collection-slide-empty small { font-size: 12px; }
    .collection-item-v2 { display: flex; align-items: flex-start; gap: 12px; padding: 12px 0; border-bottom: 1px solid rgba(63,63,70,0.3); }
    .collection-item-v2:last-child { border-bottom: none; }
    .collection-item-v2 .ci-content { flex: 1; min-width: 0; }
    .collection-item-v2 .ci-title { font-size: 13px; font-weight: 500; line-height: 1.4; margin-bottom: 2px; }
    .collection-item-v2 .ci-title a { color: var(--text-primary); text-decoration: none; }
    .collection-item-v2 .ci-title a:hover { color: var(--accent); }
    .collection-item-v2 .ci-source { font-size: 11px; color: var(--text-muted); }
    .collection-item-v2 .ci-remove { width: 24px; height: 24px; display: flex; align-items: center; justify-content: center; border: none; background: none; color: var(--text-muted); cursor: pointer; font-size: 14px; flex-shrink: 0; border-radius: 4px; }
    .collection-item-v2 .ci-remove:hover { color: var(--accent); background: var(--bg-elevated); }
    .collection-slide-footer { padding: 16px 20px; border-top: 1px solid var(--border); display: flex; gap: 8px; }
    .collection-slide-footer button { flex: 1; padding: 9px 0; font-size: 13px; font-weight: 500; border-radius: var(--radius-xs); cursor: pointer; border: 1px solid var(--border); background: var(--bg-elevated); color: var(--text-secondary); }
    .collection-slide-footer button:hover { color: var(--text-primary); border-color: var(--border-hover); }
    .collection-slide-footer .btn-export { background: var(--accent); color: var(--bg-deep); border-color: var(--accent); }
    .collection-slide-footer .btn-export:hover { opacity: 0.9; }

    /* ─── AUTH MODAL ─── */
    #auth-modal { display: none; position: fixed; inset: 0; z-index: 400; background: rgba(0,0,0,0.6); align-items: center; justify-content: center; padding: 24px; }
    #auth-modal.show { display: flex; }
    .auth-panel { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); max-width: 380px; width: 100%; padding: 32px; position: relative; }
    .auth-panel-close { position: absolute; top: 12px; right: 12px; width: 28px; height: 28px; border: none; background: var(--bg-elevated); color: var(--text-secondary); font-size: 16px; cursor: pointer; border-radius: var(--radius-xs); display: flex; align-items: center; justify-content: center; }
    .auth-panel-close:hover { color: var(--text-primary); }
    .auth-panel h3 { font-size: 20px; font-weight: 700; margin-bottom: 4px; }
    .auth-panel .auth-subtitle { font-size: 13px; color: var(--text-secondary); margin-bottom: 20px; }
    .auth-field { margin-bottom: 14px; }
    .auth-field label { font-size: 12px; color: var(--text-secondary); display: block; margin-bottom: 4px; }
    .auth-field input, .auth-field select { width: 100%; padding: 10px 12px; font-size: 14px; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-xs); color: var(--text-primary); }
    .auth-field input:focus, .auth-field select:focus { outline: none; border-color: var(--accent); }
    .auth-btn { width: 100%; padding: 11px; font-size: 14px; font-weight: 600; background: var(--accent); color: var(--bg-deep); border: none; border-radius: var(--radius-xs); cursor: pointer; margin-top: 6px; }
    .auth-btn:hover { opacity: 0.9; }
    .auth-btn:disabled { opacity: 0.5; cursor: not-allowed; }
    .auth-switch { text-align: center; margin-top: 14px; font-size: 13px; color: var(--text-muted); }
    .auth-switch a { color: var(--accent); text-decoration: none; cursor: pointer; }
    .auth-switch a:hover { text-decoration: underline; }
    .auth-error { color: #f87171; font-size: 12px; margin-top: 8px; display: none; }
    .auth-error.show { display: block; }
    .auth-user-info { text-align: center; }
    .auth-user-info .avatar { width: 56px; height: 56px; border-radius: 50%; background: var(--gradient-accent); display: flex; align-items: center; justify-content: center; font-size: 24px; margin: 0 auto 12px; }
    .auth-user-info .username { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
    .auth-user-info .user-meta { font-size: 12px; color: var(--text-muted); margin-bottom: 16px; }
    .auth-user-actions { display: flex; flex-direction: column; gap: 8px; }
    .auth-user-actions button { width: 100%; padding: 9px; font-size: 13px; border: 1px solid var(--border); border-radius: var(--radius-xs); background: var(--bg-elevated); color: var(--text-secondary); cursor: pointer; }
    .auth-user-actions button:hover { color: var(--text-primary); border-color: var(--border-hover); }
    .auth-user-actions .btn-logout { color: #f87171; border-color: rgba(248,113,113,0.3); }
    .auth-user-actions .btn-logout:hover { background: rgba(248,113,113,0.1); }

    /* ═══════ "请先登录" 按钮修复样式 ═══════ */
    .btn-login-prompt {
      background: linear-gradient(135deg, #60a5fa 0%, #a78bfa 100%) !important;
      color: #fff !important;
      border: none !important;
      cursor: pointer !important;
      font-weight: 600 !important;
      animation: loginPulse 2s ease-in-out infinite;
    }
    .btn-login-prompt:hover {
      opacity: 0.9;
      transform: translateY(-1px);
      box-shadow: 0 4px 16px rgba(96,165,250,0.4);
    }
    @keyframes loginPulse {
      0%, 100% { box-shadow: 0 0 0 0 rgba(96,165,250,0.3); }
      50% { box-shadow: 0 0 12px 2px rgba(96,165,250,0.2); }
    }

    /* ═══════ X (TWITTER) SOURCE ICON ═══════ */
    .news-source-icon.src-x {
      background: #000;
      color: #fff;
      font-size: 11px;
      font-weight: 800;
      font-family: system-ui, sans-serif;
    }

    /* ═══════ AI 知识趣味区域 ═══════ */
    .ai-knowledge-section {
      margin-top: 56px;
      position: relative;
    }
    .ai-knowledge-card {
      display: grid;
      grid-template-columns: 1fr 120px;
      gap: 20px;
      padding: 28px 32px;
      background: rgba(30,41,59,0.55);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(148,163,184,0.12);
      border-radius: 20px;
      cursor: pointer;
      transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
      position: relative;
      overflow: hidden;
    }
    .ai-knowledge-card::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(96,165,250,0.04), rgba(167,139,250,0.06), rgba(52,211,153,0.03));
      pointer-events: none;
    }
    .ai-knowledge-card:hover {
      border-color: rgba(96,165,250,0.3);
      transform: translateY(-2px);
      box-shadow: 0 8px 32px rgba(96,165,250,0.12);
    }
    .ai-knowledge-card.aki-flip {
      animation: akiFlip 0.4s ease;
    }
    @keyframes akiFlip {
      0% { opacity: 1; transform: translateY(0); }
      40% { opacity: 0; transform: translateY(-8px) scale(0.98); }
      60% { opacity: 0; transform: translateY(8px) scale(0.98); }
      100% { opacity: 1; transform: translateY(0) scale(1); }
    }
    .ai-knowledge-left {
      display: flex;
      flex-direction: column;
      gap: 10px;
      position: relative;
      z-index: 1;
    }
    .ai-knowledge-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 11px;
      font-weight: 700;
      color: var(--accent);
      background: rgba(96,165,250,0.1);
      padding: 4px 12px;
      border-radius: 20px;
      width: fit-content;
      letter-spacing: 0.03em;
    }
    .ai-knowledge-right {
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      z-index: 1;
    }
    .ai-knowledge-illustration {
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .aki-big-icon {
      font-size: 64px;
      filter: drop-shadow(0 4px 12px rgba(96,165,250,0.2));
      animation: akiIconFloat 3s ease-in-out infinite;
    }
    @keyframes akiIconFloat {
      0%, 100% { transform: translateY(0) scale(1); }
      50% { transform: translateY(-6px) scale(1.05); }
    }
    .ai-knowledge-term {
      font-family: 'Plus Jakarta Sans', sans-serif;
      font-size: 20px;
      font-weight: 700;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .aki-icon {
      font-size: 24px;
      display: inline-block;
    }
    .ai-knowledge-explain {
      font-size: 14px;
      color: var(--text-secondary);
      line-height: 1.7;
    }
    .ai-knowledge-analogy {
      font-size: 13px;
      color: var(--text-primary);
      line-height: 1.7;
      padding: 12px 16px;
      background: rgba(52,211,153,0.06);
      border: 1px solid rgba(52,211,153,0.12);
      border-radius: 12px;
      border-left: 3px solid #34d399;
    }
    .ai-knowledge-footer {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      margin-top: 16px;
    }
    .aki-refresh-btn, .aki-viewall-btn {
      padding: 9px 22px;
      font-size: 13px;
      font-weight: 600;
      border-radius: 50px;
      cursor: pointer;
      transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
      font-family: 'Plus Jakarta Sans', sans-serif;
    }
    .aki-refresh-btn {
      background: rgba(51,65,85,0.5);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border: 1px solid rgba(148,163,184,0.15);
      color: var(--text-secondary);
    }
    .aki-refresh-btn:hover {
      color: var(--text-primary);
      border-color: rgba(96,165,250,0.4);
      transform: translateY(-1px);
      box-shadow: 0 4px 16px rgba(96,165,250,0.1);
    }
    .aki-viewall-btn {
      background: linear-gradient(135deg, rgba(52,211,153,0.15), rgba(96,165,250,0.15));
      border: 1px solid rgba(52,211,153,0.25);
      color: #34d399;
    }
    .aki-viewall-btn:hover {
      background: linear-gradient(135deg, rgba(52,211,153,0.25), rgba(96,165,250,0.25));
      transform: translateY(-1px);
      box-shadow: 0 4px 16px rgba(52,211,153,0.15);
    }

    @keyframes knowledgeBounce {
      0%, 100% { transform: translateY(0) rotate(0deg); }
      25% { transform: translateY(-6px) rotate(-5deg); }
      75% { transform: translateY(-3px) rotate(3deg); }
    }

    @media (max-width: 640px) {
      .ai-knowledge-card {
        grid-template-columns: 1fr;
        gap: 12px;
        padding: 20px;
      }
      .ai-knowledge-right {
        display: none;
      }
      .ai-knowledge-section {
        margin-top: 40px;
      }
      .ai-knowledge-term {
        font-size: 17px;
      }
      .ai-knowledge-footer {
        flex-direction: column;
        gap: 8px;
      }
      .aki-refresh-btn, .aki-viewall-btn {
        width: 100%;
        text-align: center;
      }
    }

    /* ═══════ 首页热点滚动条 ═══════ */
    .home-ticker {
      margin-top: 40px;
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 0;
      border-top: 1px solid rgba(148,163,184,0.08);
      border-bottom: 1px solid rgba(148,163,184,0.08);
      overflow: hidden;
      position: relative;
    }
    .home-ticker-label {
      font-size: 12px;
      font-weight: 700;
      color: #ff6b35;
      background: rgba(255,107,53,0.1);
      padding: 4px 12px;
      border-radius: 20px;
      white-space: nowrap;
      flex-shrink: 0;
      animation: tickerLabelPulse 2s ease-in-out infinite;
    }
    @keyframes tickerLabelPulse {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.7; }
    }
    .home-ticker-track {
      flex: 1;
      overflow: hidden;
      mask-image: linear-gradient(90deg, transparent, #000 5%, #000 95%, transparent);
      -webkit-mask-image: linear-gradient(90deg, transparent, #000 5%, #000 95%, transparent);
    }
    .ticker-inner {
      display: flex;
      gap: 24px;
      animation: tickerScroll 40s linear infinite;
      width: max-content;
    }
    .ticker-inner:hover {
      animation-play-state: paused;
    }
    @keyframes tickerScroll {
      0% { transform: translateX(0); }
      100% { transform: translateX(-50%); }
    }
    .ticker-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      color: var(--text-secondary);
      text-decoration: none;
      white-space: nowrap;
      transition: color 0.2s;
      padding: 2px 0;
    }
    .ticker-item:hover {
      color: var(--accent);
    }

    @media (max-width: 640px) {
      .home-ticker {
        margin-top: 28px;
      }
    }

    /* ═══════ UI 优化增强 ═══════ */

    /* 首页 Hero 区域增强 */
    .home-hero {
      margin-bottom: 48px;
      position: relative;
    }
    .home-hero::before {
      content: '';
      position: absolute;
      top: -60px;
      left: 50%;
      transform: translateX(-50%);
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(96,165,250,0.08) 0%, rgba(167,139,250,0.04) 40%, transparent 70%);
      pointer-events: none;
      animation: heroGlow 6s ease-in-out infinite;
    }
    @keyframes heroGlow {
      0%, 100% { opacity: 0.6; transform: translateX(-50%) scale(1); }
      50% { opacity: 1; transform: translateX(-50%) scale(1.1); }
    }

    /* 首页标题动画增强 */
    .home-title {
      position: relative;
      background-size: 200% auto;
      animation: titleGradient 4s ease-in-out infinite;
    }
    @keyframes titleGradient {
      0%, 100% { background-position: 0% center; }
      50% { background-position: 100% center; }
    }

    /* 首页卡片增强 - 玻璃态毛玻璃效果 */
    .home-card {
      position: relative;
    }
    .home-card::before {
      content: '';
      position: absolute;
      inset: 0;
      border-radius: 16px;
      padding: 1px;
      background: linear-gradient(135deg, rgba(96,165,250,0.0), rgba(167,139,250,0.1), rgba(52,211,153,0.0));
      -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      -webkit-mask-composite: xor;
      mask-composite: exclude;
      pointer-events: none;
      opacity: 0;
      transition: opacity 0.3s ease;
    }
    .home-card:hover::before {
      opacity: 1;
    }

    /* 统计数字动画 */
    .home-stat-num {
      background: linear-gradient(135deg, var(--text-primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* 优化卡片间距和响应式 */
    .home-grid {
      margin-bottom: 48px;
    }

    /* 新闻卡片悬浮增强 */
    .news-card {
      position: relative;
    }
    .news-card::after {
      content: '';
      position: absolute;
      inset: -1px;
      border-radius: var(--radius-sm);
      background: linear-gradient(135deg, rgba(96,165,250,0.2), rgba(167,139,250,0.2));
      opacity: 0;
      z-index: -1;
      transition: opacity 0.3s;
      filter: blur(8px);
    }
    .news-card:hover::after {
      opacity: 1;
    }

    /* 页面切换动画增强 */
    .page.active {
      animation: pageEnterSmooth 0.4s cubic-bezier(0.22, 1, 0.36, 1) forwards;
    }
    @keyframes pageEnterSmooth {
      from { opacity: 0; transform: translateY(16px) scale(0.99); }
      to { opacity: 1; transform: translateY(0) scale(1); }
    }

    /* 滚动条美化 */
    ::-webkit-scrollbar { width: 6px; }
    ::-webkit-scrollbar-track { background: transparent; }
    ::-webkit-scrollbar-thumb { background: rgba(148,163,184,0.2); border-radius: 3px; }
    ::-webkit-scrollbar-thumb:hover { background: rgba(148,163,184,0.35); }

    /* Header 增强 - 毛玻璃效果 */
    .site-header {
      background: rgba(9, 9, 11, 0.8);
      backdrop-filter: blur(20px) saturate(1.5);
      -webkit-backdrop-filter: blur(20px) saturate(1.5);
    }

    /* Footer 增强 */
    .site-footer {
      position: relative;
    }
    .site-footer::before {
      content: '';
      position: absolute;
      top: 0;
      left: 20%;
      right: 20%;
      height: 1px;
      background: linear-gradient(90deg, transparent, rgba(96,165,250,0.3), rgba(167,139,250,0.3), transparent);
    }

    /* 首页卡片图标增强 */
    .home-card-icon {
      transition: all 0.3s ease;
    }
    .home-card:hover .home-card-icon {
      transform: scale(1.1) rotate(-5deg);
      box-shadow: 0 4px 16px rgba(96,165,250,0.2);
    }

    /* 工具卡片列表增强 */
    .tool-card {
      position: relative;
      overflow: hidden;
    }
    .tool-card::after {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 50%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(96,165,250,0.03), transparent);
      transition: left 0.5s ease;
    }
    .tool-card:hover::after {
      left: 100%;
    }

    /* nav 链接呼吸灯效果增强 */
    .site-nav a.active {
      position: relative;
    }
    .site-nav a.active::before {
      content: '';
      position: absolute;
      bottom: -1px;
      left: 8px;
      right: 8px;
      height: 2px;
      background: var(--gradient-accent);
      border-radius: 1px;
    }

    /* ═══════ "学AI" NAV HIGHLIGHT ═══════ */
    .nav-learn-highlight:not(.active) {
      background: linear-gradient(135deg, rgba(52,211,153,0.12), rgba(96,165,250,0.12));
      color: #34d399 !important;
      font-weight: 600;
      border-radius: var(--radius-xs);
      animation: learnGlow 3s ease-in-out infinite;
    }
    @keyframes learnGlow { 0%,100% { box-shadow: none; } 50% { box-shadow: 0 0 12px rgba(52,211,153,0.25); } }

    /* ═══════ 学AI 页面 ═══════ */
    .learn-page {
      max-width: 1100px;
      margin: 0 auto;
      padding: 20px 24px 80px;
    }
    .learn-hero {
      text-align: center;
      padding: 48px 24px 40px;
      position: relative;
      overflow: hidden;
      background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(52,211,153,0.12) 0%, transparent 60%),
        radial-gradient(ellipse 60% 40% at 80% 80%, rgba(96,165,250,0.1) 0%, transparent 50%);
      border-radius: 20px;
      margin-bottom: 32px;
    }
    .learn-hero-emoji {
      font-size: 56px;
      margin-bottom: 12px;
      animation: knowledgeBounce 3s ease-in-out infinite;
    }
    .learn-hero h2 {
      font-family: 'Plus Jakarta Sans', sans-serif;
      font-size: 32px;
      font-weight: 800;
      background: linear-gradient(135deg, #34d399, #60a5fa, #a78bfa);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 8px;
    }
    .learn-hero p {
      font-size: 15px;
      color: var(--text-secondary);
      max-width: 500px;
      margin: 0 auto;
    }
    .learn-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
      gap: 20px;
    }
    .learn-card {
      background: rgba(30,41,59,0.5);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid rgba(148,163,184,0.1);
      border-radius: 16px;
      padding: 24px;
      transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
      opacity: 0;
      animation: learnCardIn 0.5s ease forwards;
    }
    @keyframes learnCardIn {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }
    .learn-card:hover {
      border-color: rgba(96,165,250,0.3);
      transform: translateY(-4px);
      box-shadow: 0 12px 40px rgba(96,165,250,0.12);
    }
    .learn-card-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 12px;
    }
    .learn-card-icon {
      font-size: 32px;
    }
    .learn-card-num {
      font-size: 12px;
      font-weight: 700;
      color: var(--text-muted);
      font-family: 'JetBrains Mono', monospace;
      background: var(--bg-elevated);
      padding: 2px 8px;
      border-radius: 999px;
    }
    .learn-card-term {
      font-family: 'Plus Jakarta Sans', sans-serif;
      font-size: 18px;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 10px;
    }
    .learn-card-explain {
      font-size: 13px;
      color: var(--text-secondary);
      line-height: 1.7;
      margin-bottom: 12px;
    }
    .learn-card-analogy {
      font-size: 12px;
      color: var(--text-primary);
      line-height: 1.7;
      padding: 12px 14px;
      background: rgba(52,211,153,0.06);
      border: 1px solid rgba(52,211,153,0.12);
      border-radius: 10px;
      border-left: 3px solid #34d399;
    }
    @media (max-width: 640px) {
      .learn-grid { grid-template-columns: 1fr; }
      .learn-hero h2 { font-size: 24px; }
      .learn-hero { padding: 32px 16px; }
      .site-nav a.nav-learn-highlight:not(.active) { font-size: 11px; background: none; box-shadow: none; animation: none; color: #34d399 !important; }
    }