:root{--primary:#4f46e5;--primary-hover:#4338ca;--bg-main:#f8fafc;--bg-card:#fff;--text-main:#0f172a;--text-muted:#64748b;--border-color:#e2e8f0;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a;--accent:#f5f3ff}*{box-sizing:border-box;margin:0;padding:0;font-family:Inter,system-ui,sans-serif}body{background:var(--bg-main);color:var(--text-main);min-height:100vh;line-height:1.5}.card{box-shadow:var(--shadow-sm);border:1px solid var(--border-color);background:#fff;border-radius:1rem;transition:all .3s}.input-field{border:1px solid var(--border-color);width:100%;color:var(--text-main);background:#fff;border-radius:.6rem;outline:none;padding:.75rem 1rem;font-size:.95rem;transition:all .2s}.input-field:focus{border-color:var(--primary);box-shadow:0 0 0 3px #4f46e51a}.btn-primary{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:.6rem;justify-content:center;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-weight:600;transition:all .2s;display:inline-flex}.btn-primary:hover{background:var(--primary-hover);box-shadow:0 4px 12px #4f46e533}.btn-ghost{color:var(--text-muted);border:1px solid var(--border-color);cursor:pointer;background:0 0;border-radius:.6rem;padding:.6rem 1.2rem;transition:all .2s}.btn-ghost:hover{color:var(--text-main);background:#f1f5f9}.login-screen{background:#f1f5f9;justify-content:center;align-items:center;min-height:100vh;display:flex}.login-box{width:100%;max-width:420px;box-shadow:var(--shadow-lg);border:1px solid var(--border-color);background:#fff;border-radius:1.5rem;padding:2.5rem}.navbar{border-bottom:1px solid var(--border-color);z-index:50;background:#fff;padding:1rem 2rem;position:sticky;top:0}.search-bar-container{flex:1;max-width:600px;position:relative}.shelf-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:2.5rem;display:grid}.book-item{flex-direction:column;height:100%;display:flex}.book-item:hover{box-shadow:var(--shadow-lg);transform:translateY(-8px)}.aspect-9-16{aspect-ratio:9/16;background:#e2e8f0;border-radius:12px;width:100%;overflow:hidden}.book-cover{object-fit:cover;width:100%;height:100%;transition:transform .5s}.dropzone{border:2px dashed var(--border-color);cursor:pointer;background:#f8fafc;border-radius:12px;flex-direction:column;justify-content:center;align-items:center;min-height:200px;transition:all .2s;display:flex}.dropzone.active{border-color:var(--primary);background:var(--accent)}.tag{background:var(--accent);color:var(--primary);border-radius:999px;align-items:center;gap:.3rem;padding:.25rem .75rem;font-size:.8rem;font-weight:600;display:inline-flex}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade{animation:.4s forwards fadeIn}