/* ============================================================
       CSS VARIABLES & RESET
    ============================================================ */
    :root {
      --bg-base: #0A0E17;
      --bg-card: #111622;
      --bg-card-hover: #161D2E;
      --bg-surface: #0D1220;
      --amber: #F5A623;
      --amber-dim: rgba(245, 166, 35, 0.15);
      --amber-glow: rgba(245, 166, 35, 0.35);
      --text-primary: #E8EAF0;
      --text-secondary: #7A8499;
      --text-muted: #4A526A;
      --border: rgba(245, 166, 35, 0.12);
      --border-hover: rgba(245, 166, 35, 0.5);
      --font-display: 'Syne', sans-serif;
      --font-mono: 'DM Mono', monospace;
      --font-body: 'Outfit', sans-serif;
    }

    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    html { scroll-behavior: smooth; }

    body {
      background: var(--bg-base);
      color: var(--text-primary);
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.6;
      overflow-x: hidden;
    }

    /* dot-grid background */
    body::before {
      content: '';
      position: fixed;
      inset: 0;
      background-image: radial-gradient(circle, rgba(245,166,35,0.06) 1px, transparent 1px);
      background-size: 32px 32px;
      pointer-events: none;
      z-index: 0;
    }

    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; display: block; }
    ul { list-style: none; }

    /* ============================================================
       SCROLLBAR
    ============================================================ */
    ::-webkit-scrollbar { width: 6px; }
    ::-webkit-scrollbar-track { background: var(--bg-base); }
    ::-webkit-scrollbar-thumb { background: var(--amber); border-radius: 3px; }

    /* ============================================================
       TRUST BANNER
    ============================================================ */
    .trust-banner {
      background: var(--amber);
      color: #0A0E17;
      font-family: var(--font-mono);
      font-size: 0.75rem;
      font-weight: 500;
      letter-spacing: 0.04em;
      overflow: hidden;
      height: 36px;
      display: flex;
      align-items: center;
      position: relative;
      z-index: 100;
    }

    .trust-banner-track {
      display: flex;
      gap: 80px;
      white-space: nowrap;
      animation: marquee 28s linear infinite;
    }

    .trust-banner-track span {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    @keyframes marquee {
      from { transform: translateX(0); }
      to   { transform: translateX(-50%); }
    }

    /* ============================================================
       NAVBAR
    ============================================================ */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 99;
      padding: 0 24px;
      height: 68px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: rgba(10, 14, 23, 0.72);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border);
      transition: border-color 0.3s;
    }

    .navbar.scrolled { border-bottom-color: var(--border-hover); }

    .nav-logo {
      font-family: var(--font-mono);
      font-size: 1rem;
      color: var(--amber);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .nav-logo .cursor {
      display: inline-block;
      width: 2px;
      height: 1em;
      background: var(--amber);
      animation: blink 1s step-end infinite;
      vertical-align: text-bottom;
    }

    @keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }

    .nav-links {
      display: flex;
      gap: 2px;
    }

    .nav-links a {
      font-family: var(--font-body);
      font-size: 0.875rem;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 6px 14px;
      border-radius: 6px;
      position: relative;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0; left: 14px; right: 14px;
      height: 2px;
      background: var(--amber);
      transform: scaleX(0);
      transition: transform 0.2s;
      border-radius: 2px;
    }

    .nav-links a:hover, .nav-links a.active {
      color: var(--text-primary);
    }

    .nav-links a:hover::after, .nav-links a.active::after {
      transform: scaleX(1);
    }

    .nav-cta {
      font-family: var(--font-mono);
      font-size: 0.8rem;
      background: var(--amber);
      color: #0A0E17 !important;
      padding: 8px 18px !important;
      border-radius: 6px !important;
      font-weight: 500;
      transition: opacity 0.2s, transform 0.2s !important;
    }

    .nav-cta::after { display: none !important; }

    .nav-cta:hover { opacity: 0.88; transform: translateY(-1px); }

    .nav-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-hover);
      color: var(--amber);
      padding: 6px 10px;
      border-radius: 6px;
      cursor: pointer;
      font-size: 1rem;
    }

    /* ============================================================
       SECTION LABEL
    ============================================================ */
    .section-label {
      font-family: var(--font-mono);
      font-size: 0.75rem;
      color: var(--amber);
      letter-spacing: 0.08em;
      text-transform: uppercase;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .section-label::after {
      content: '';
      flex: 1;
      height: 1px;
      background: var(--border);
      max-width: 120px;
    }

    .section-title {
      font-family: var(--font-display);
      font-size: clamp(1.8rem, 4vw, 2.8rem);
      font-weight: 800;
      line-height: 1.15;
      color: var(--text-primary);
      margin-bottom: 12px;
    }

    .section-sub {
      font-size: 1rem;
      color: var(--text-secondary);
      max-width: 520px;
      margin-bottom: 48px;
    }

    section { position: relative; z-index: 1; }

    /* ============================================================
       HERO
    ============================================================ */
    #home {
      min-height: calc(100vh - 104px);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      padding: 80px 5vw 80px;
      position: relative;
      overflow: hidden;
    }

    #home::before {
      content: '';
      position: absolute;
      top: -200px; right: -200px;
      width: 700px; height: 700px;
      background: radial-gradient(circle, rgba(245,166,35,0.1) 0%, transparent 65%);
      pointer-events: none;
    }

    .hero-eyebrow {
      font-family: var(--font-mono);
      font-size: 0.8rem;
      color: var(--amber);
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .hero-eyebrow::before {
      content: '';
      width: 32px; height: 1px;
      background: var(--amber);
    }

    .hero-title {
      font-family: var(--font-display);
      font-size: clamp(2.4rem, 5.5vw, 4.2rem);
      font-weight: 800;
      line-height: 1.08;
      margin-bottom: 24px;
    }

    .hero-title .line-amber { color: var(--amber); display: block; }

    .hero-subtitle {
      font-family: var(--font-mono);
      font-size: 0.9rem;
      color: var(--text-secondary);
      margin-bottom: 36px;
      line-height: 1.7;
    }

    .hero-subtitle .comment { color: var(--text-muted); }

    .hero-badges {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
      margin-bottom: 36px;
    }

    .hero-badge {
      font-family: var(--font-mono);
      font-size: 0.75rem;
      padding: 6px 14px;
      border: 1px solid var(--border-hover);
      border-radius: 100px;
      color: var(--amber);
      background: var(--amber-dim);
    }

    .hero-cta {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      background: var(--amber);
      color: #0A0E17;
      font-family: var(--font-display);
      font-size: 1rem;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: 8px;
      position: relative;
      overflow: hidden;
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .hero-cta::before {
      content: '';
      position: absolute;
      top: 0; left: -100%;
      width: 60%; height: 100%;
      background: rgba(255,255,255,0.22);
      transform: skewX(-20deg);
      transition: left 0.4s ease;
    }

    .hero-cta:hover::before { left: 160%; }
    .hero-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(245,166,35,0.3); }

    /* hero visual */
    .hero-visual {
      display: flex;
      justify-content: center;
      align-items: center;
      position: relative;
    }

    .book-stack {
      position: relative;
      width: 280px;
      height: 340px;
    }

    .book-stack-item {
      position: absolute;
      border-radius: 6px;
      overflow: hidden;
      box-shadow: 0 20px 60px rgba(0,0,0,0.6);
      transition: transform 0.4s ease;
    }

    .book-stack-item:nth-child(1) {
      width: 170px; height: 220px;
      bottom: 0; left: 50%;
      transform: translateX(-50%) rotate(-6deg);
      z-index: 1;
    }

    .book-stack-item:nth-child(2) {
      width: 170px; height: 220px;
      bottom: 30px; left: 50%;
      transform: translateX(-50%) rotate(3deg);
      z-index: 2;
    }

    .book-stack-item:nth-child(3) {
      width: 170px; height: 220px;
      bottom: 60px; left: 50%;
      transform: translateX(-50%) rotate(-1deg);
      z-index: 3;
    }

    .book-stack:hover .book-stack-item:nth-child(1) { transform: translateX(-70%) rotate(-12deg) translateY(10px); }
    .book-stack:hover .book-stack-item:nth-child(2) { transform: translateX(-50%) rotate(0deg); }
    .book-stack:hover .book-stack-item:nth-child(3) { transform: translateX(-30%) rotate(10deg) translateY(10px); }

    .book-stack-item img { width: 100%; height: 100%; object-fit: cover; }

    .hero-glow {
      position: absolute;
      bottom: -20px; left: 50%;
      transform: translateX(-50%);
      width: 240px; height: 40px;
      background: radial-gradient(ellipse, rgba(245,166,35,0.4) 0%, transparent 70%);
      filter: blur(12px);
    }

    /* ============================================================
       STATS BAR
    ============================================================ */
    #stats {
      background: var(--bg-surface);
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
      padding: 40px 5vw;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-item {}

    .stat-number {
      font-family: var(--font-display);
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--amber);
      line-height: 1;
      margin-bottom: 6px;
    }

    .stat-label {
      font-family: var(--font-mono);
      font-size: 0.75rem;
      color: var(--text-muted);
      letter-spacing: 0.06em;
      text-transform: uppercase;
    }

    /* ============================================================
       RECOMMENDATIONS
    ============================================================ */
    #recommendations {
      padding: 80px 5vw;
    }

    .filters-row {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
      margin-bottom: 32px;
      align-items: center;
    }

    .search-wrap {
      position: relative;
      flex: 1;
      min-width: 240px;
    }

    .search-wrap i {
      position: absolute;
      left: 14px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--text-muted);
      font-size: 0.85rem;
    }

    #bookSearch {
      width: 100%;
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 8px;
      color: var(--text-primary);
      font-family: var(--font-mono);
      font-size: 0.85rem;
      padding: 12px 16px 12px 40px;
      outline: none;
      transition: border-color 0.2s;
    }

    #bookSearch:focus { border-color: var(--amber); }
    #bookSearch::placeholder { color: var(--text-muted); }

    .filter-tabs {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
    }

    .filter-tab {
      font-family: var(--font-mono);
      font-size: 0.78rem;
      padding: 9px 18px;
      border: 1px solid var(--border);
      border-radius: 6px;
      background: none;
      color: var(--text-secondary);
      cursor: pointer;
      transition: all 0.2s;
    }

    .filter-tab:hover { border-color: var(--amber); color: var(--amber); }

    .filter-tab.active {
      background: var(--amber);
      color: #0A0E17;
      border-color: var(--amber);
      font-weight: 600;
    }

    /* BOOK GRID */
    #booksContainer {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-bottom: 40px;
    }

    /* BOOK CARD */
    .book-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 12px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
      position: relative;
      cursor: pointer;
    }

    .book-card:hover {
      border-color: var(--border-hover);
      transform: translateY(-4px) perspective(800px) rotateX(1deg);
      box-shadow: 0 20px 50px rgba(0,0,0,0.4), 0 0 0 1px var(--amber-glow);
    }

    .book-card::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--amber), transparent);
      opacity: 0;
      transition: opacity 0.3s;
    }

    .book-card:hover::before { opacity: 1; }

    .book-card-image {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background: #0D1220;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .book-card-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .book-card:hover .book-card-image img { transform: scale(1.04); }

    .book-badge-pill {
      position: absolute;
      top: 12px; right: 12px;
      font-family: var(--font-mono);
      font-size: 0.65rem;
      font-weight: 500;
      background: var(--amber);
      color: #0A0E17;
      padding: 4px 10px;
      border-radius: 100px;
      letter-spacing: 0.04em;
      z-index: 2;
    }

    .book-card-body {
      padding: 20px;
      display: flex;
      flex-direction: column;
      flex: 1;
      gap: 10px;
    }

    .book-category-pill {
      display: inline-block;
      font-family: var(--font-mono);
      font-size: 0.68rem;
      color: var(--amber);
      background: var(--amber-dim);
      padding: 3px 10px;
      border-radius: 4px;
      border: 1px solid rgba(245,166,35,0.2);
      width: fit-content;
    }

    .book-card-title {
      font-family: var(--font-display);
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-primary);
      line-height: 1.35;
      display: -webkit-box;
      -webkit-line-clamp: 3;
      line-clamp: 3;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }

    .book-card-author {
      font-family: var(--font-mono);
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    .book-rating {
      font-size: 0.85rem;
      color: var(--amber);
      letter-spacing: 1px;
    }

    .book-meta-list {
      border-top: 1px solid var(--border);
      padding-top: 10px;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .book-meta-list li {
      font-size: 0.8rem;
      color: var(--text-secondary);
      line-height: 1.4;
    }

    .book-meta-list li strong {
      color: var(--text-primary);
      font-weight: 600;
    }

    .book-why {
      font-size: 0.78rem;
      color: var(--text-muted);
      font-style: italic;
    }

    .amazon-btn {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      margin-top: auto;
      padding: 11px 20px;
      border: 1px solid var(--amber);
      border-radius: 7px;
      color: var(--amber);
      font-family: var(--font-mono);
      font-size: 0.8rem;
      font-weight: 500;
      background: none;
      transition: background 0.2s, color 0.2s;
      position: relative;
      overflow: hidden;
    }

    .amazon-btn::before {
      content: '';
      position: absolute;
      inset: 0;
      background: var(--amber);
      transform: scaleX(0);
      transform-origin: left;
      transition: transform 0.3s ease;
      z-index: 0;
    }

    .amazon-btn:hover::before { transform: scaleX(1); }
    .amazon-btn:hover { color: #0A0E17; }
    .amazon-btn span, .amazon-btn i { position: relative; z-index: 1; }

    .affiliate-note {
      font-size: 0.68rem;
      color: var(--text-muted);
      text-align: center;
    }

    /* PAGINATION */
    #pagination {
      display: flex;
      justify-content: center;
      gap: 8px;
      flex-wrap: wrap;
    }

    .page-btn {
      font-family: var(--font-mono);
      font-size: 0.82rem;
      width: 38px; height: 38px;
      border-radius: 6px;
      border: 1px solid var(--border);
      background: none;
      color: var(--text-secondary);
      cursor: pointer;
      transition: all 0.2s;
    }

    .page-btn:hover { border-color: var(--amber); color: var(--amber); }
    .page-btn.active { background: var(--amber); color: #0A0E17; border-color: var(--amber); font-weight: 700; }

    /* DISCLOSURE */
    .disclosure {
      margin-top: 40px;
      padding: 20px 24px;
      border: 1px solid var(--border);
      border-radius: 10px;
      font-family: var(--font-mono);
      font-size: 0.75rem;
      color: var(--text-muted);
      background: var(--bg-card);
    }

    .disclosure strong { color: var(--amber); }

    /* ============================================================
       PROBLEM SOLVER
    ============================================================ */
    #problem-solver {
      padding: 80px 5vw;
      background: var(--bg-surface);
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
    }

    .problem-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .problem-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 28px;
      transition: border-color 0.3s, box-shadow 0.3s;
      position: relative;
      overflow: hidden;
    }

    .problem-card::after {
      content: '';
      position: absolute;
      bottom: 0; left: 0; right: 0;
      height: 3px;
      background: linear-gradient(90deg, var(--amber), rgba(245,166,35,0));
      opacity: 0;
      transition: opacity 0.3s;
    }

    .problem-card:hover { border-color: var(--border-hover); box-shadow: 0 12px 40px rgba(0,0,0,0.3); }
    .problem-card:hover::after { opacity: 1; }

    .problem-icon {
      width: 52px; height: 52px;
      border-radius: 10px;
      background: var(--amber-dim);
      border: 1px solid rgba(245,166,35,0.25);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      color: var(--amber);
      margin-bottom: 18px;
    }

    .problem-card h4 {
      font-family: var(--font-display);
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .problem-card p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 16px; }

    .tag-row { display: flex; gap: 8px; flex-wrap: wrap; }

    .tag {
      font-family: var(--font-mono);
      font-size: 0.68rem;
      padding: 4px 10px;
      border-radius: 4px;
      background: var(--amber-dim);
      color: var(--amber);
      border: 1px solid rgba(245,166,35,0.2);
    }

    /* ============================================================
       CATEGORIES
    ============================================================ */
    #categories {
      padding: 80px 5vw;
    }

    .categories-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }

    .category-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 10px;
      padding: 24px 20px;
      text-align: center;
      cursor: pointer;
      transition: all 0.3s;
      position: relative;
      overflow: hidden;
    }

    .category-card::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, var(--amber-dim), transparent);
      opacity: 0;
      transition: opacity 0.3s;
    }

    .category-card:hover { border-color: var(--border-hover); transform: translateY(-3px); }
    .category-card:hover::before { opacity: 1; }

    .cat-icon {
      font-size: 1.8rem;
      color: var(--amber);
      margin-bottom: 12px;
    }

    .category-card h5 {
      font-family: var(--font-display);
      font-size: 0.95rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .category-card p {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* ============================================================
       EARN MONEY
    ============================================================ */
    #earn-money {
      padding: 80px 5vw;
      background: var(--bg-surface);
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
    }

    .earn-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .earn-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 12px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: border-color 0.3s, box-shadow 0.3s;
      position: relative;
    }

    .earn-card:hover { border-color: var(--border-hover); box-shadow: 0 16px 40px rgba(0,0,0,0.4); }

    .earn-card.featured {
      border-color: rgba(245,166,35,0.4);
    }

    .featured-badge {
      position: absolute;
      top: 0; right: 24px;
      font-family: var(--font-mono);
      font-size: 0.68rem;
      font-weight: 600;
      background: var(--amber);
      color: #0A0E17;
      padding: 4px 12px 6px;
      border-radius: 0 0 8px 8px;
      z-index: 2;
      letter-spacing: 0.04em;
    }

    .earn-card-header {
      padding: 28px 24px 20px;
      display: flex;
      align-items: center;
      gap: 16px;
      border-bottom: 1px solid var(--border);
    }

    .earn-icon {
      width: 48px; height: 48px;
      border-radius: 10px;
      background: var(--amber-dim);
      border: 1px solid rgba(245,166,35,0.25);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      color: var(--amber);
      flex-shrink: 0;
    }

    .earn-card-header h4 {
      font-family: var(--font-display);
      font-size: 1.1rem;
      font-weight: 700;
    }

    .earn-amount {
      font-family: var(--font-mono);
      font-size: 0.8rem;
      color: var(--amber);
      margin-top: 2px;
    }

    .earn-card-body {
      padding: 20px 24px;
      flex: 1;
    }

    .earn-list { display: flex; flex-direction: column; gap: 8px; }

    .earn-list li {
      font-size: 0.82rem;
      color: var(--text-secondary);
      display: flex;
      align-items: flex-start;
      gap: 8px;
    }

    .earn-list li i { color: var(--amber); margin-top: 2px; flex-shrink: 0; }

    .earn-tip {
      margin-top: 16px;
      padding: 12px 14px;
      background: var(--amber-dim);
      border-radius: 7px;
      border-left: 2px solid var(--amber);
      font-size: 0.78rem;
      color: var(--text-secondary);
    }

    .earn-tip strong { color: var(--amber); }

    .earn-card-footer {
      padding: 20px 24px;
      border-top: 1px solid var(--border);
    }

    .earn-btn {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      width: 100%;
      padding: 12px 20px;
      background: var(--amber);
      color: #0A0E17;
      font-family: var(--font-display);
      font-size: 0.9rem;
      font-weight: 700;
      border-radius: 7px;
      transition: opacity 0.2s, transform 0.2s;
      border: none;
      cursor: pointer;
    }

    .earn-btn:hover { opacity: 0.88; transform: translateY(-1px); }

    .earn-ref {
      display: block;
      text-align: center;
      font-family: var(--font-mono);
      font-size: 0.65rem;
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* earn info box */
    .earn-info-box {
      margin-top: 48px;
      background: var(--bg-card);
      border: 1px solid var(--border-hover);
      border-radius: 14px;
      padding: 36px;
    }

    .earn-info-box h4 {
      font-family: var(--font-display);
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 24px;
      color: var(--amber);
    }

    .info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

    .info-item {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      font-size: 0.85rem;
      color: var(--text-secondary);
    }

    .info-item i { color: var(--amber); margin-top: 2px; }
    .info-item strong { color: var(--text-primary); }

    .earn-estimate {
      margin-top: 24px;
      padding: 16px 20px;
      background: rgba(245,166,35,0.08);
      border-radius: 8px;
      font-size: 0.875rem;
      color: var(--text-secondary);
      border: 1px dashed rgba(245,166,35,0.3);
    }

    .earn-estimate strong { color: var(--amber); }

    /* ============================================================
       FAQ
    ============================================================ */
    #faq {
      padding: 80px 5vw;
    }

    .faq-list { display: flex; flex-direction: column; gap: 12px; max-width: 800px; }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 10px;
      overflow: hidden;
      transition: border-color 0.2s;
    }

    .faq-item.open { border-color: var(--border-hover); }

    .faq-q {
      width: 100%;
      background: none;
      border: none;
      color: var(--text-primary);
      font-family: var(--font-display);
      font-size: 1rem;
      font-weight: 600;
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      cursor: pointer;
      text-align: left;
    }

    .faq-q i {
      color: var(--amber);
      font-size: 0.85rem;
      flex-shrink: 0;
      transition: transform 0.3s;
    }

    .faq-item.open .faq-q i { transform: rotate(45deg); }

    .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.2s;
    }

    .faq-item.open .faq-a { max-height: 300px; }

    .faq-a-inner {
      padding: 0 24px 20px;
      font-size: 0.88rem;
      color: var(--text-secondary);
      line-height: 1.7;
      border-top: 1px solid var(--border);
      padding-top: 16px;
    }

    /* ============================================================
       FOOTER
    ============================================================ */
    footer {
      background: var(--bg-surface);
      border-top: 1px solid var(--border);
      padding: 60px 5vw 32px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 48px;
    }

    .footer-brand .nav-logo { font-size: 1.1rem; margin-bottom: 16px; display: inline-flex; }

    .footer-brand p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .social-links { display: flex; gap: 12px; }

    .social-link {
      width: 38px; height: 38px;
      border: 1px solid var(--border);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-secondary);
      font-size: 0.9rem;
      transition: all 0.2s;
    }

    .social-link:hover { border-color: var(--amber); color: var(--amber); transform: scale(1.1); }

    .footer-col h6 {
      font-family: var(--font-mono);
      font-size: 0.7rem;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      color: var(--amber);
      margin-bottom: 16px;
    }

    .footer-links { display: flex; flex-direction: column; gap: 8px; }

    .footer-links a {
      font-size: 0.85rem;
      color: var(--text-muted);
      transition: color 0.2s;
    }

    .footer-links a:hover { color: var(--amber); }

    .footer-links p {
      font-size: 0.82rem;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .footer-links p i { color: var(--amber); font-size: 0.75rem; }

    .footer-bottom {
      border-top: 1px solid var(--border);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
    }

    .footer-bottom p {
      font-family: var(--font-mono);
      font-size: 0.7rem;
      color: var(--text-muted);
    }

    .footer-bottom span { color: var(--amber); }

    /* ============================================================
       ANIMATIONS
    ============================================================ */
    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(24px); }
      to   { opacity: 1; transform: translateY(0); }
    }

    .fade-up {
      opacity: 0;
      animation: fadeUp 0.6s ease forwards;
    }

    .fade-up-delay-1 { animation-delay: 0.1s; }
    .fade-up-delay-2 { animation-delay: 0.2s; }
    .fade-up-delay-3 { animation-delay: 0.3s; }
    .fade-up-delay-4 { animation-delay: 0.4s; }

    /* scroll reveal */
    .reveal {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }

    .reveal.visible { opacity: 1; transform: none; }

    /* ============================================================
       EARN FAQ ACCORDION
    ============================================================ */
    .earn-faq { max-width: 800px; margin-top: 48px; }

    .earn-faq h4 {
      font-family: var(--font-display);
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    /* ============================================================
       NO RESULTS
    ============================================================ */
    .no-results {
      grid-column: 1 / -1;
      text-align: center;
      padding: 60px 20px;
      color: var(--text-muted);
    }

    .no-results i { font-size: 2rem; color: var(--text-muted); margin-bottom: 12px; display: block; }
    .no-results p { font-family: var(--font-mono); font-size: 0.85rem; }

    /* ============================================================
       RESPONSIVE
    ============================================================ */
    @media (max-width: 1024px) {
      #home { grid-template-columns: 1fr; text-align: center; padding-top: 60px; }
      .hero-visual { display: none; }
      .hero-eyebrow { justify-content: center; }
      .hero-badges { justify-content: center; }
      #booksContainer { grid-template-columns: repeat(2, 1fr); }
      .categories-grid { grid-template-columns: repeat(3, 1fr); }
      .earn-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; flex-direction: column; position: fixed; top: 68px; left: 0; right: 0; background: rgba(10,14,23,0.98); backdrop-filter: blur(20px); padding: 20px; border-bottom: 1px solid var(--border); gap: 4px; }
      .nav-links.open { display: flex; }
      .nav-toggle { display: block; }
      #home { padding: 40px 5vw; }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .problem-grid { grid-template-columns: 1fr; }
      #booksContainer { grid-template-columns: 1fr; }
      .categories-grid { grid-template-columns: repeat(2, 1fr); }
      .earn-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; text-align: center; }
      .info-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 480px) {
      .categories-grid { grid-template-columns: 1fr 1fr; }
      .filters-row { flex-direction: column; align-items: stretch; }
    }