:root{--primary: #6366f1;--primary-hover: #4f46e5;--bg-deep: #cbd5e1;--bg-card: rgba(255, 255, 255, .4);--text-main: #334155;--text-muted: #64748b;--glass-border: rgba(0, 0, 0, .1);--glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, .08);--danger: #ef4444;--glass-bg: rgba(96, 177, 185, .05);--accent: #555759}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-deep)}::-webkit-scrollbar-thumb{background:var(--glass-border);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}::selection{background:var(--primary);color:#fff}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,system-ui,sans-serif;background:var(--bg-deep);color:var(--text-main);min-height:100vh;line-height:1.6}.app-container{max-width:1200px;margin:0 auto;padding:2rem}.glass-card{background:var(--bg-card);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:1rem;box-shadow:var(--glass-shadow)}.btn{padding:.75rem 1.5rem;border-radius:.5rem;border:none;font-weight:600;cursor:pointer;transition:all .3s ease;display:inline-flex;align-items:center;justify-content:center;gap:.5rem}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover);transform:translateY(-2px)}.btn-danger{background:var(--danger);color:#fff}.input-field{width:100%;padding:.75rem;border-radius:.5rem;border:1px solid var(--glass-border);background:#d3def880;color:var(--text-main);margin-bottom:1rem}.input-field:focus{outline:2px solid var(--primary);border-color:transparent}h1,h2,h3{margin-bottom:1.5rem}a{color:var(--primary);text-decoration:none}@media(max-width:768px){.app-container{padding:1rem}}.navbar{display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem;margin-bottom:2rem;position:sticky;top:1rem;z-index:100}.nav-logo{display:flex;align-items:center;gap:.75rem;font-size:1.5rem;font-weight:800;background:linear-gradient(to right,var(--primary),var(--accent));background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.nav-links{display:flex;gap:1rem}.book-card{padding:1.5rem;display:flex;flex-direction:column;gap:1rem;transition:transform .3s ease}.book-card:hover{transform:translateY(-5px)}.book-title{margin:0;font-size:1.25rem;color:var(--text-main)}.book-genre{font-size:.8rem;padding:.25rem .5rem;background:var(--glass-bg);border-radius:2rem;border:1px solid var(--glass-border);color:var(--accent)}.book-info-item{display:flex;align-items:center;gap:.5rem;color:var(--text-muted);font-size:.9rem}.book-card-actions{display:flex;justify-content:flex-end;gap:.5rem;margin-top:auto;padding-top:1rem;border-top:1px solid var(--glass-border)}.btn-icon{background:none;border:1px solid var(--glass-border);color:var(--text-muted);padding:.5rem;border-radius:.5rem;cursor:pointer;transition:all .2s}.btn-icon:hover{background:var(--primary);color:#fff;border-color:var(--primary)}.btn-icon-danger:hover{background:var(--danger);border-color:var(--danger)}.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:2rem;margin-top:1rem}.loading{text-align:center;padding:4rem;color:var(--text-muted);font-size:1.25rem}.form-container{max-width:600px;margin:2rem auto;padding:2.5rem}.form-actions{display:flex;gap:1rem;margin-top:2rem}.form-actions .btn{flex:1}.details-container{max-width:800px;margin:2rem auto;padding:3rem;position:relative}.back-btn{position:absolute;top:1.5rem;left:1.5rem}.details-header{margin-top:1rem;display:flex;flex-direction:column;gap:.5rem;margin-bottom:2.5rem}.details-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:2rem;margin-bottom:3rem}.detail-item{display:flex;gap:1rem;align-items:center}.detail-item label{display:block;font-size:.8rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em}.detail-item p{font-size:1.1rem;font-weight:500}.details-actions{border-top:1px solid var(--glass-border);padding-top:2rem}.search-bar{position:relative;margin-bottom:2rem;max-width:600px}.search-icon{position:absolute;left:1rem;top:50%;transform:translateY(-50%);color:var(--text-muted);pointer-events:none}.search-input{padding-left:3rem;margin-bottom:0;color:var(--text-main)}.empty-state{text-align:center;padding:4rem 2rem;display:flex;flex-direction:column;align-items:center;gap:1rem;color:var(--text-muted)}.empty-state h3{margin:0;color:var(--text-main)}.category-section{margin-bottom:4rem}.category-title{font-size:1.75rem;font-weight:700;margin-bottom:2rem;color:var(--text-main);border-left:4px solid var(--primary);padding-left:1rem}