:root{--bd-bg-primary:#0f172a;--bd-bg-secondary:#1e293b;--bd-bg-tertiary:#334155;--bd-bg-elevated:#1e293b;--bd-text-primary:#f8fafc;--bd-text-secondary:#94a3b8;--bd-text-muted:#64748b;--bd-text-inverse:#0f172a;--bd-brand-primary:#22c55e;--bd-brand-hover:#16a34a;--bd-brand-muted:#22c55e20;--bd-success:#22c55e;--bd-warning:#f59e0b;--bd-error:#ef4444;--bd-info:#3b82f6;--bd-border-default:#334155;--bd-border-focus:#6366f1;--bd-font-sans:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--bd-font-mono:"JetBrains Mono", "Fira Code", Consolas, monospace;--bd-text-xs:.75rem;--bd-text-sm:.875rem;--bd-text-base:1rem;--bd-text-lg:1.125rem;--bd-text-xl:1.25rem;--bd-text-2xl:1.5rem;--bd-text-3xl:1.875rem;--bd-text-4xl:2.25rem;--bd-font-normal:400;--bd-font-medium:500;--bd-font-semibold:600;--bd-font-bold:700;--bd-space-0:0;--bd-space-1:.25rem;--bd-space-2:.5rem;--bd-space-3:.75rem;--bd-space-4:1rem;--bd-space-5:1.25rem;--bd-space-6:1.5rem;--bd-space-8:2rem;--bd-space-10:2.5rem;--bd-space-12:3rem;--bd-space-16:4rem;--bd-space-20:5rem;--bd-radius-none:0;--bd-radius-sm:.375rem;--bd-radius-md:.5rem;--bd-radius-lg:.75rem;--bd-radius-xl:1rem;--bd-radius-2xl:1.5rem;--bd-radius-full:9999px;--bd-shadow-sm:0 1px 2px #0000004d;--bd-shadow-md:0 4px 6px #0000004d;--bd-shadow-lg:0 10px 15px #0000004d;--bd-shadow-xl:0 20px 25px #0000004d;--bd-transition-fast:.1s ease;--bd-transition-normal:.15s ease;--bd-transition-slow:.3s 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var(--bd-transition-fast);text-decoration:none}a:hover{text-decoration:underline}a:focus-visible{outline:2px solid var(--bd-border-focus);outline-offset:2px}button{cursor:pointer;background:0 0;border:none;font-family:inherit}input,textarea,select{font-family:inherit;font-size:inherit}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bd-bg-secondary)}::-webkit-scrollbar-thumb{background:var(--bd-bg-tertiary);border-radius:var(--bd-radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--bd-text-muted)}*{scrollbar-width:thin;scrollbar-color:var(--bd-bg-tertiary) var(--bd-bg-secondary)}.bd-sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.bd-truncate{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.bd-btn{justify-content:center;align-items:center;gap:var(--bd-space-2);padding:var(--bd-space-2) var(--bd-space-4);font-size:var(--bd-text-sm);font-weight:var(--bd-font-medium);border-radius:var(--bd-radius-md);transition:all var(--bd-transition-normal);cursor:pointer;border:none;display:inline-flex}.bd-btn:focus-visible{outline:2px solid var(--bd-border-focus);outline-offset:2px}.bd-btn:disabled{opacity:.5;cursor:not-allowed}.bd-btn-primary{background-color:var(--bd-brand-primary);color:var(--bd-text-inverse)}.bd-btn-primary:hover:not(:disabled){background-color:var(--bd-brand-hover)}.bd-btn-secondary{background-color:var(--bd-bg-tertiary);color:var(--bd-text-primary)}.bd-btn-secondary:hover:not(:disabled){background-color:var(--bd-border-default)}.bd-btn-ghost{color:var(--bd-text-secondary);background-color:#0000}.bd-btn-ghost:hover:not(:disabled){background-color:var(--bd-bg-tertiary);color:var(--bd-text-primary)}.bd-btn-danger{background-color:var(--bd-error);color:#fff}.bd-btn-danger:hover:not(:disabled){background-color:#dc2626}.bd-btn-sm{padding:var(--bd-space-1) var(--bd-space-2);font-size:var(--bd-text-xs)}.bd-btn-lg{padding:var(--bd-space-3) var(--bd-space-6);font-size:var(--bd-text-base)}.bd-card{background-color:var(--bd-bg-secondary);border:1px solid var(--bd-border-default);border-radius:var(--bd-radius-lg);padding:var(--bd-space-4)}.bd-card-elevated{box-shadow:var(--bd-shadow-md)}.bd-input{width:100%;padding:var(--bd-space-2) var(--bd-space-3);background-color:var(--bd-bg-tertiary);border:1px solid var(--bd-border-default);border-radius:var(--bd-radius-md);color:var(--bd-text-primary);font-size:var(--bd-text-sm);transition:border-color var(--bd-transition-fast), box-shadow var(--bd-transition-fast)}.bd-input:focus{border-color:var(--bd-border-focus);outline:none;box-shadow:0 0 0 2px #6366f133}.bd-input::placeholder{color:var(--bd-text-muted)}.bd-input:disabled{opacity:.5;cursor:not-allowed}.bd-input-error{border-color:var(--bd-error)}.bd-input-error:focus{box-shadow:0 0 0 2px #ef444433}.bd-badge{padding:var(--bd-space-1) var(--bd-space-2);font-size:var(--bd-text-xs);font-weight:var(--bd-font-medium);border-radius:var(--bd-radius-full);background-color:var(--bd-bg-tertiary);color:var(--bd-text-secondary);align-items:center;display:inline-flex}.bd-badge-success{color:var(--bd-success);background-color:#22c55e33}.bd-badge-warning{color:var(--bd-warning);background-color:#f59e0b33}.bd-badge-error{color:var(--bd-error);background-color:#ef444433}.bd-badge-info{color:var(--bd-info);background-color:#3b82f633}.bd-empty-state{padding:var(--bd-space-12);text-align:center;color:var(--bd-text-muted);flex-direction:column;justify-content:center;align-items:center;display:flex}.bd-spinner{border:2px solid var(--bd-bg-tertiary);border-top-color:var(--bd-brand-primary);border-radius:50%;width:1.5rem;height:1.5rem;animation:.6s linear infinite bd-spin}.bd-spinner-sm{width:1rem;height:1rem}.bd-spinner-lg{width:2rem;height:2rem}@keyframes bd-spin{to{transform:rotate(360deg)}}.bd-overlay{z-index:var(--bd-z-modal);background-color:#0009;position:fixed;inset:0}.bd-modal{background-color:var(--bd-bg-secondary);border:1px solid var(--bd-border-default);border-radius:var(--bd-radius-xl);padding:var(--bd-space-6);max-width:90vw;max-height:90vh;z-index:calc(var(--bd-z-modal) + 1);box-shadow:var(--bd-shadow-xl);position:fixed;top:50%;left:50%;overflow:auto;transform:translate(-50%,-50%)}.btn{justify-content:center;align-items:center;gap:var(--bd-space-2);padding:var(--bd-space-2) var(--bd-space-4);font-size:var(--bd-text-sm);font-weight:var(--bd-font-medium);border-radius:var(--bd-radius-md);transition:all var(--bd-transition-normal);display:inline-flex}.btn-primary{background-color:var(--bd-brand-primary);color:var(--bd-text-inverse)}.btn-primary:hover{background-color:var(--bd-brand-hover)}.btn-secondary{background-color:var(--bd-bg-tertiary);color:var(--bd-text-primary)}.btn-secondary:hover{background-color:var(--bd-border-default)}.btn-ghost{color:var(--bd-text-secondary);background-color:#0000}.btn-ghost:hover{background-color:var(--bd-bg-tertiary);color:var(--bd-text-primary)}.card{background-color:var(--bd-bg-secondary);border:1px solid var(--bd-border-default);border-radius:var(--bd-radius-lg);padding:var(--bd-space-4)}.input{width:100%;padding:var(--bd-space-2) var(--bd-space-3);background-color:var(--bd-bg-tertiary);border:1px solid var(--bd-border-default);border-radius:var(--bd-radius-md);color:var(--bd-text-primary);font-size:var(--bd-text-sm)}.input:focus{border-color:var(--bd-border-focus);outline:none;box-shadow:0 0 0 2px 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var(--bd-border-default,#334155)}.bd-confirm-btn-cancel:hover:not(:disabled){background:var(--bd-bg-secondary,#1e293b)}.bd-confirm-btn-danger{background:var(--bd-confirm-accent,var(--bd-error,#ef4444));color:#fff}.bd-confirm-btn-danger:hover:not(:disabled){filter:brightness(.9)}.bd-confirm-btn-warning{background:var(--bd-confirm-accent,var(--bd-warning,#f59e0b));color:#fff}.bd-confirm-btn-warning:hover:not(:disabled){filter:brightness(.9)}.bd-confirm-btn-info{background:var(--bd-confirm-accent,var(--bd-info,#3b82f6));color:#fff}.bd-confirm-btn-info:hover:not(:disabled){filter:brightness(.9)}.bd-confirm-spinner{border:2px solid #ffffff4d;border-top-color:#fff;border-radius:50%;width:14px;height:14px;animation:.6s linear infinite bd-spin;display:inline-block}@keyframes bd-fade-in{0%{opacity:0}to{opacity:1}}@keyframes bd-slide-up{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.login-btn,.logout-btn{cursor:pointer;border:none;border-radius:6px;padding:8px 16px;font-size:.85rem;font-weight:600;transition:all .2s}.login-btn{color:#fff;background:#ffffff26;border:1px solid #ffffff4d}.login-btn:hover{background:#ffffff40}.logout-btn{color:#ff8a8a;background:#dc354533;border:1px solid #dc35454d}.logout-btn:hover{background:#dc354559}.auth-status{align-items:center;gap:12px;display:flex}.user-profile{align-items:center;gap:8px;display:flex}.user-avatar{background:var(--bd-brand-primary);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;font-size:.75rem;font-weight:700;display:flex}.user-name{color:#ffffffe6;font-size:.85rem}.auth-callback-page{min-height:60vh;color:var(--bd-text-secondary);flex-direction:column;justify-content:center;align-items:center;display:flex}.auth-callback-page p{margin-top:16px;font-size:1.1rem}.user-menu{position:relative}.user-menu-trigger{color:#ffffffe6;cursor:pointer;background:#ffffff14;border:1px solid #fff3;border-radius:24px;align-items:center;gap:6px;padding:4px 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.2s;display:flex;position:absolute;top:50%;right:15px;transform:translateY(-50%)}.clear-search-btn:hover{background:var(--bd-text-secondary)}.books-grid{grid-template-columns:repeat(3,1fr);gap:15px;display:grid}.row{flex-wrap:wrap;width:100%;display:flex}.col-4{flex:0 0 33.3333%;max-width:33.3333%}.col-8{flex:0 0 66.6667%;max-width:66.6667%}.book-card{background:var(--bd-bg-secondary);border:2px solid var(--bd-border-default);box-shadow:var(--bd-shadow-sm);cursor:pointer;border-radius:8px;transition:transform .3s,box-shadow .3s,border-color .3s;overflow:hidden}.book-card:hover{box-shadow:var(--bd-shadow-lg);border-color:var(--bd-brand-primary);transform:translateY(-3px)}.book-thumbnail{background:var(--bd-brand-primary);justify-content:center;align-items:center;width:100%;height:100%;min-height:100px;display:flex;overflow:hidden}.book-thumbnail img{object-fit:cover;width:100%;height:100%;transition:transform .3s}.book-card:hover .book-thumbnail img{transform:scale(1.05)}.thumbnail-placeholder{background:var(--bd-brand-primary);justify-content:center;align-items:center;width:100%;height:100%;display:flex}.thumbnail-placeholder span{font-size:2rem}.book-info{box-sizing:border-box;flex-direction:column;justify-content:center;height:100%;padding:10px;display:flex}.book-title{color:var(--bd-text-primary);margin:0 0 4px;font-size:1.3rem;line-height:1.2}.book-author{color:var(--bd-text-secondary);margin:0 0 6px;font-size:1.08rem;font-style:italic}.book-description{color:var(--bd-text-secondary);-webkit-line-clamp:3;-webkit-box-orient:vertical;margin:0;font-size:1rem;line-height:1.4;display:-webkit-box;overflow:hidden}.loading-message,.error-message,.no-results{text-align:center;color:var(--bd-text-muted);padding:40px;font-size:1.2rem}.error-message{color:var(--bd-error)}.no-results{grid-column:1/-1}.no-results-container{text-align:center;grid-column:1/-1;padding:20px}.load-from-cloud{background:var(--bd-brand-primary);color:#fff;border-radius:12px;margin-top:20px;padding:20px}.load-from-cloud p{margin:0 0 15px;font-size:1.1rem}.load-cloud-btn{color:var(--bd-brand-primary);cursor:pointer;background:#fff;border:none;border-radius:25px;padding:12px 24px;font-size:1rem;font-weight:600;transition:transform .2s,box-shadow .2s}.load-cloud-btn:hover{transform:translateY(-2px);box-shadow:0 4px 15px #0003}@media (width<=1200px){.books-grid{grid-template-columns:repeat(2,1fr)}}@media 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