:root{--primary: #1c1c1c;--secondary: #511ce2;--accent: #8e44ad;--light: #ecf0f1;--dark: #2c2c2c;--warning: #f39c12;--text: #333333;--border-radius: 6px;--box-shadow: 0 4px 6px rgba(0, 0, 0, .1);--transition: all .3s ease}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Roboto,sans-serif;line-height:1.6;color:var(--text);background-color:#f5f7fa;margin:0;padding:0;min-height:100vh;display:flex;flex-direction:column}.container{max-width:1200px;margin:0 auto;padding:0 20px}main{flex:1;padding:2rem;margin-bottom:60px}header{background:var(--primary);color:#fff;padding:1rem 2rem;padding-left:70px;box-shadow:var(--box-shadow);position:relative}header h1{font-family:Playfair Display,serif;margin:0;font-size:2rem;position:relative;padding-left:40px;display:flex;align-items:center;justify-content:center}header:before{content:"";position:absolute;top:50%;left:50px;transform:translateY(-50%);width:60px;height:60px;background-image:url(/assets/logo-BNvRQtnW.svg);background-repeat:no-repeat;background-size:contain}.primary-nav{margin-top:1rem}nav ul{list-style:none;padding:0;display:flex;justify-content:center;flex-wrap:wrap;gap:.5rem}nav ul li{margin:0}nav ul li a{display:inline-block;padding:.5rem 1rem;color:#fff;text-decoration:none;border-radius:var(--border-radius);transition:var(--transition);background-color:#ffffff1a}nav ul li a:hover{background-color:#fff3;transform:translateY(-2px)}nav ul li a.active{background-color:var(--secondary);font-weight:500}.left-nav ul{padding-top:10px;justify-content:flex-start}.inventory-nav{background-color:var(--secondary);padding:1rem;position:static;top:0;z-index:100;box-shadow:var(--box-shadow)}.inventory-nav select{max-width:300px;margin:0 auto;display:block;padding:.6rem 1rem;border:none;border-radius:var(--border-radius);background-color:#fff;font-weight:500;cursor:pointer;box-shadow:var(--box-shadow)}h2{color:var(--primary);margin:1.5rem 0;font-weight:700;position:relative;display:inline-block}h2:after{content:"";position:absolute;bottom:-5px;left:0;right:0;height:3px;background-color:var(--secondary);border-radius:3px}.book-info{text-align:center;margin:0 auto;max-width:500px}.copy-div{text-align:center;display:block;width:100%}button,input[type=submit],input[type=button]{background-color:var(--secondary);color:#fff;border:none;border-radius:var(--border-radius);padding:.7rem 1.2rem;cursor:pointer;font-weight:500;transition:var(--transition);box-shadow:var(--box-shadow);display:block;margin:0 auto}button:hover,input[type=submit]:hover,input[type=button]:hover{background-color:#7d3c98;transform:translateY(-2px)}main a{color:var(--secondary);text-decoration:none;transition:var(--transition)}main a:hover{color:#7d3c98;text-decoration:underline}.button-group{display:flex;justify-content:center;gap:50px}.button-group button{display:inline-block;margin:0;padding:.7rem 1.2rem;font-size:1rem}.input-group{display:flex;align-items:center;gap:8px}.input-group button{height:40px;padding:8px 12px;white-space:nowrap}td a{display:inline-block;margin:.2rem;padding:.4rem .8rem;border-radius:var(--border-radius);text-decoration:none;color:#fff;font-size:.9rem;transition:var(--transition)}td a[href*=edit],td a[href*=delete],td a[href*=add]{background-color:var(--secondary)}td a:hover{opacity:.9;transform:scale(1.05);text-decoration:none;color:#fff!important}table{width:100%;border-collapse:collapse;margin:1.5rem 0;background:#fff;border-radius:var(--border-radius);overflow:hidden;box-shadow:var(--box-shadow)}th{background-color:var(--primary);color:#fff;font-weight:500;text-align:left;padding:1rem}td{border-bottom:1px solid #eee;padding:1rem;text-align:left}tr:last-child td{border-bottom:none}tr:nth-child(2n){background-color:#f8f9fa}form{max-width:800px;margin:2rem auto;background:#fff;padding:2rem;border-radius:var(--border-radius);box-shadow:16px 16px 24px #00000048;border:none;transition:box-shadow .3s ease-in-out}fieldset{border:1px solid rgba(0,0,0,.1);padding:1.5rem;margin:1.5rem 0;border-radius:var(--border-radius);background:#fff}legend{padding:0 .5rem;color:var(--primary);font-weight:500}label{display:block;margin:1rem 0 .5rem;font-weight:500;color:var(--primary)}input[type=text],input[type=number],input[type=email],input[type=password],input[type=date],select{width:100%;padding:1rem;margin-bottom:1rem;border:1px solid rgba(0,0,0,.1);border-radius:var(--border-radius);background-color:#fff;font-size:1rem;transition:all .3s ease-in-out;box-shadow:inset 0 2px 4px #00000014}input:focus,select:focus{outline:none;border-color:var(--secondary);box-shadow:0 0 6px #8e44ad4d,inset 0 2px 4px #00000014}select[multiple]{height:160px}fieldset button{margin-top:.5rem;width:auto}ul#currentAuthors li,ul#currentGenres li{background-color:#f5f7fa;padding:.5rem;margin:.5rem 0;border-radius:var(--border-radius);display:flex;justify-content:space-between;align-items:center}ul#currentAuthors button,ul#currentGenres button{background-color:var(--secondary);padding:.3rem .6rem;margin:0}header,header p{text-align:center}.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin:1rem 0}.card{display:block;background:var(--light);padding:1rem;border-radius:var(--border-radius);box-shadow:var(--box-shadow);text-align:center;text-decoration:none;color:var(--primary);transition:var(--transition)}.card:hover{transform:translateY(-2px);background:#f8f9fa}footer{padding:1rem;background-color:var(--primary);color:#fff;text-align:center;margin-top:auto;position:fixed;bottom:0;width:100%}.tooltip{display:block;text-align:center;position:relative}.tooltip .tooltiptext{visibility:hidden;width:160px;background-color:var(--dark);color:#fff;text-align:center;border-radius:var(--border-radius);padding:.5rem;position:absolute;z-index:1;bottom:125%;left:50%;transform:translate(-50%);opacity:0;transition:opacity .3s}.tooltip button:disabled:hover+.tooltiptext,.tooltip button:disabled:focus+.tooltiptext{visibility:visible;opacity:1}.tooltip button:hover .tooltiptext{visibility:visible;opacity:1}#undoReturnButton:hover+.tooltiptext{visibility:visible;opacity:1}@keyframes zoomIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}main{animation:zoomIn .5s ease-out}button:hover,input[type=submit]:hover,input[type=button]:hover{animation:pulse .6s ease-in-out}@media (max-width: 768px){header h1{font-size:1.5rem;padding-left:30px}header h1:before{font-size:1.3rem}nav ul{flex-direction:column;align-items:center}nav ul li a{width:100%;text-align:center}main{padding:1rem}table{font-size:.9rem}th,td{padding:.6rem}.table-container{overflow-x:auto}}