:root{--primary: #0d9488;--secondary: #0f766e;--bg: #0f172a;--card: #1e293b;--text: #f1f5f9;--text-dim: #94a3b8;--border: #334155}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,sans-serif;background-color:var(--bg);color:var(--text);line-height:1.5}.admin-container{display:flex;min-height:100vh}.sidebar{width:260px;background-color:var(--card);border-right:1px solid var(--border);padding:2rem 1rem;display:flex;flex-direction:column;gap:2rem}.logo{font-size:1.5rem;font-weight:700;color:var(--primary);display:flex;align-items:center;gap:.5rem}.nav-links{list-style:none;display:flex;flex-direction:column;gap:.5rem}.nav-item{padding:.75rem 1rem;border-radius:.5rem;cursor:pointer;display:flex;align-items:center;gap:.75rem;transition:all .2s;color:var(--text-dim)}.nav-item:hover,.nav-item.active{background-color:var(--primary);color:#fff}.main-content{flex:1;padding:2rem;overflow-y:auto}.header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}.card{background-color:var(--card);border:1px solid var(--border);border-radius:1rem;padding:1.5rem}.btn{padding:.6rem 1.2rem;border-radius:.5rem;border:none;cursor:pointer;font-weight:600;transition:opacity .2s}.btn-primary{background-color:var(--primary);color:#fff}.btn-secondary{background-color:var(--border);color:var(--text)}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem}.form-group{margin-bottom:1.5rem}.form-group label{display:block;margin-bottom:.5rem;color:var(--text-dim)}input,select,textarea{width:100%;padding:.75rem;border-radius:.5rem;border:1px solid var(--border);background-color:var(--bg);color:var(--text);outline:none}input:focus{border-color:var(--primary)}.book-item{display:flex;gap:1rem;padding:1rem;border-bottom:1px solid var(--border)}.book-cover{width:60px;height:90px;border-radius:.25rem;object-fit:cover}.book-info h4{margin-bottom:.25rem}.book-info p{color:var(--text-dim);font-size:.9rem}.login-page{display:flex;justify-content:center;align-items:center;min-height:100vh;padding:1rem}.dashboard-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.5rem;margin-bottom:2rem}.stat-card.clickable{cursor:pointer;transition:transform .2s,box-shadow .2s}.stat-card.clickable:hover{transform:translateY(-4px);box-shadow:0 10px 15px -3px #0000001a;border-color:var(--primary)}.stat-card{background:var(--card);padding:1.5rem;border-radius:1rem;border:1px solid var(--border);display:flex;align-items:center;gap:1.25rem;box-shadow:0 4px 6px -1px #0000001a}.stat-icon{width:50px;height:50px;background:#0d94881a;color:var(--primary);border-radius:12px;display:flex;align-items:center;justify-content:center}.stat-info h3{font-size:1.5rem;margin:0;color:var(--text)}.stat-info p{font-size:.875rem;color:var(--text-dim);margin:0}.user-item{transition:background .2s}.user-item:hover{background:#00000005}.loading-screen{display:flex;height:100vh;align-items:center;justify-content:center;font-weight:600;color:var(--primary)}.btn-danger{background-color:#ef4444;color:#fff}.bulk-actions{display:flex;justify-content:space-between;align-items:center;padding:1rem;background-color:var(--bg);border-radius:.5rem;margin-bottom:1rem;border:1px solid var(--border)}input[type=checkbox]{width:18px;height:18px;cursor:pointer;accent-color:var(--primary)}.book-checkbox{margin-right:1rem}