/* -------------------------
     Reset & root
     ------------------------- */
  :root{
    --bg: #f6f8fb;
    --card: #fff;
    --muted: #6b7280;
    --accent: #7b2ff7;
    --accent-2: #9a4dff;
    --success: #16a34a;
    --danger: #ef4444;
    --glass: rgba(255,255,255,0.6);
    --shadow: 0 8px 24px rgba(12,20,40,0.06);
    --radius: 12px;
    --max-width: 1200px;
  }

  *{box-sizing:border-box}
  body{
    margin:0; font-family:"Poppins",system-ui,Segoe UI,Roboto,Arial;
    background:linear-gradient(180deg,#f3f5f9 0%,var(--bg)100%);
    color:#111; -webkit-font-smoothing:antialiased;
  }

  a{color:inherit;text-decoration:none}
  button{font-family:inherit}

  /* -------------------------
     Layout (sidebar + main)
     ------------------------- */
  .wrap{
    max-width:var(--max-width); margin:24px auto; display:flex; gap:20px;
    padding:0 16px;
  }

  /* Sidebar */
  .sidebar{
    width:260px; min-width:200px; background:linear-gradient(180deg,var(--accent),var(--accent-2));
    color:white; border-radius:var(--radius); padding:18px; box-shadow:var(--shadow);
    display:flex; flex-direction:column; gap:18px;
  }
  .brand{display:flex;gap:12px;align-items:center}
  .brand .logo{width:44px;height:44px;border-radius:8px;background:rgba(255,255,255,0.12);display:flex;align-items:center;justify-content:center;font-size:22px}
  .brand h1{font-size:18px;margin:0;font-weight:600}
  .brand p{margin:0;font-size:12px;opacity:.95}

  .menu{display:flex;flex-direction:column;gap:6px}
  .menu a{display:flex;gap:10px;align-items:center;padding:10px;border-radius:8px;color:rgba(255,255,255,0.95);font-weight:500}
  .menu a.active, .menu a:hover{background:rgba(255,255,255,0.08)}

  .collapse-btn{margin-top:auto;background:transparent;border:none;color:white;cursor:pointer;font-weight:600;display:flex;gap:8px;align-items:center}

  /* Main */
  .main{
    flex:1; display:flex; flex-direction:column; gap:18px;
  }

  header.top{
    display:flex; align-items:center; justify-content:space-between; gap:12px;
  }
  .search-area{
    flex:1; display:flex; gap:12px; align-items:center;
  }
  .search-box{
    display:flex; gap:8px; align-items:center; background:var(--card); padding:10px 12px; border-radius:10px; box-shadow:0 6px 18px rgba(16,24,40,0.04); min-width:280px;
  }
  .search-box input{border:0; outline:0; font-size:14px; min-width:160px}
  .controls{display:flex; gap:10px; align-items:center}

  .user{
    display:flex; align-items:center; gap:12px;
  }
  .avatar{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:linear-gradient(90deg,var(--accent),var(--accent-2)); color:white; font-weight:700}

  /* Filter panel */
  .filters{
    display:flex; gap:12px; align-items:center; flex-wrap:wrap;
    background:transparent;
  }
  .chip, select, .small-btn{
    background:var(--card); border:0; padding:8px 10px; border-radius:10px; box-shadow:0 6px 18px rgba(16,24,40,0.04); font-size:13px;
  }
  .chip{display:flex;gap:8px; align-items:center}
  .chip .material-icons{font-size:18px;opacity:.7}

  /* Content area */
  .content{
    display:flex; gap:18px;
  }

  /* Left: listings */
  .panel{
    flex:1; background:var(--card); border-radius:12px; padding:18px; box-shadow:var(--shadow);
  }

  .panel h2{margin:0 0 12px 0; font-size:18px}
  .toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px;flex-wrap:wrap}
  .view-toggle{display:flex;gap:8px}
  .view-toggle button{background:transparent;border:1px solid #eee;padding:8px;border-radius:8px;cursor:pointer}
  .summary{font-size:13px;color:var(--muted)}

  /* Books grid / list */
  .books-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
  .book{
    display:flex; gap:12px; align-items:flex-start; padding:12px; border-radius:10px; background:linear-gradient(180deg,#fff,#fcfcff);
    border:1px solid #f0f0f5;
    transition:transform .18s ease, box-shadow .18s ease;
  }
  .book:hover{transform:translateY(-6px); box-shadow:0 12px 40px rgba(12,20,40,0.06)}
  .thumb{width:70px;height:95px;border-radius:6px;background:#ddd;flex-shrink:0;display:flex;align-items:center;justify-content:center;color:#555;font-weight:600}
  .meta{flex:1}
  .meta h3{font-size:15px;margin:0 0 6px}
  .meta p{margin:0;font-size:13px;color:var(--muted)}
  .meta .tags{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}
  .tag{background:#f3f4f6;color:#374151;padding:6px 8px;border-radius:999px;font-size:12px}

  .book-actions{display:flex;flex-direction:column;gap:8px;align-items:flex-end}
  .btn{padding:8px 12px;border-radius:8px;border:0;cursor:pointer;font-weight:600}
  .btn.primary{background:linear-gradient(90deg,var(--accent),var(--accent-2));color:white}
  .btn.ghost{background:transparent;border:1px solid #eee}

  /* Right: details / quickfilters */
  .side{
    width:320px; min-width:240px; display:flex; flex-direction:column; gap:12px;
  }
  .filter-section{background:var(--card);padding:14px;border-radius:12px;box-shadow:var(--shadow)}
  .filter-section h4{margin:0 0 8px 0;font-size:14px}
  .list-check{display:flex;flex-direction:column;gap:8px; max-height:260px; overflow:auto; padding-right:6px}
  .list-check label{display:flex;align-items:center;gap:8px;font-size:14px}
  .range{display:flex;gap:8px;align-items:center}

  /* Pagination */
  .pagination{display:flex;gap:8px;align-items:center;justify-content:center;margin-top:12px}
  .pg{padding:8px 10px;border-radius:8px;border:1px solid #eee; background:white; cursor:pointer}
  .pg.active{background:linear-gradient(90deg,var(--accent),var(--accent-2)); color:white; border-color:transparent}

  /* Modal */
  .modal-backdrop{position:fixed;inset:0;background:rgba(11,15,30,0.5);display:flex;align-items:center;justify-content:center;z-index:1000}
  .modal{background:var(--card);width:92%;max-width:820px;border-radius:12px;padding:18px;box-shadow:0 40px 80px rgba(8,14,30,0.6);display:flex;gap:18px}
  .modal .left{width:180px}
  .modal .right{flex:1}
  .close-btn{background:transparent;border:0;font-size:20px;cursor:pointer;color:var(--muted)}

  
  /* Small screens */
  @media (max-width: 900px){
    .wrap{padding:0 12px}
    .sidebar{display:none}
    .side{display:none}
    .books-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}
    .modal{flex-direction:column; width:94%}
  }

  @media (max-width:600px){
    .books-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr))}
    .thumb{width:60px;height:84px}
    .filter-section h4{font-size:13px}
  }