:root{--bg: #f1f5f9;--surface: #ffffff;--surface-muted: #f8fafc;--ink: #0f172a;--ink-secondary: #334155;--muted: #64748b;--border: #e2e8f0;--border-strong: #cbd5e1;--accent: #1d4ed8;--accent-hover: #1e40af;--accent-soft: #eff6ff;--sidebar: #0f172a;--sidebar-border: #1e293b;--sidebar-text: #94a3b8;--sidebar-active: #ffffff;--danger: #dc2626;--danger-hover: #b91c1c;--success: #047857;--success-soft: #ecfdf5;--error-soft: #fef2f2;--radius: 10px;--radius-lg: 14px;--shadow-sm: 0 1px 2px rgba(15, 23, 42, .05);--shadow: 0 8px 24px rgba(15, 23, 42, .06);--shadow-lg: 0 20px 40px rgba(15, 23, 42, .12);font-family:Inter,system-ui,-apple-system,sans-serif;color:var(--ink);background:var(--bg);line-height:1.5}*{box-sizing:border-box}body{margin:0;min-height:100vh;-webkit-font-smoothing:antialiased}h1,h2,h3{font-family:"Source Serif 4",Georgia,serif;font-weight:600;margin:0;letter-spacing:-.02em}button,input,textarea,select{font:inherit}a{color:var(--accent)}.app-shell{min-height:100vh}.loading-screen,.loading-inline{display:flex;align-items:center;justify-content:center;gap:12px;color:var(--muted)}.loading-screen{min-height:100vh;flex-direction:column}.loading-spinner{width:28px;height:28px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.dashboard{display:grid;grid-template-columns:260px 1fr;min-height:100vh}.sidebar{background:var(--sidebar);color:var(--sidebar-text);display:flex;flex-direction:column;padding:24px 16px;border-right:1px solid var(--sidebar-border);position:sticky;top:0;height:100vh}.sidebar-brand{display:flex;align-items:center;gap:12px;padding:0 8px 24px;border-bottom:1px solid var(--sidebar-border);margin-bottom:20px}.sidebar-brand strong{display:block;color:var(--sidebar-active);font-size:1rem;font-family:Inter,sans-serif;font-weight:600}.sidebar-brand span{font-size:.8rem;color:var(--sidebar-text)}.sidebar-logo{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;background:linear-gradient(135deg,#2563eb,#1d4ed8);color:#fff;font-weight:700;font-family:Inter,sans-serif;flex-shrink:0}.sidebar-nav{display:grid;gap:6px;flex:1}.sidebar-link{display:flex;align-items:center;gap:10px;width:100%;border:none;background:transparent;color:var(--sidebar-text);padding:11px 12px;border-radius:8px;cursor:pointer;text-align:left;font-weight:500;transition:background .15s ease,color .15s ease}.sidebar-link:hover{background:#ffffff0f;color:#e2e8f0}.sidebar-link.active{background:#2563eb33;color:#fff}.sidebar-link-icon{width:20px;text-align:center;font-size:.95rem;opacity:.9}.sidebar-footer{border-top:1px solid var(--sidebar-border);padding-top:16px;display:grid;gap:12px}.user-chip{display:flex;align-items:center;gap:10px;padding:0 4px}.user-avatar{width:36px;height:36px;border-radius:50%;background:#334155;color:#fff;display:grid;place-items:center;font-size:.8rem;font-weight:600;flex-shrink:0}.user-meta{min-width:0}.user-meta strong{display:block;color:#e2e8f0;font-size:.88rem;font-family:Inter,sans-serif;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-meta span{display:block;font-size:.75rem;color:var(--sidebar-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.dashboard-main{min-width:0}.page-header{padding:28px 32px 0}.page-eyebrow{margin:0 0 6px;font-size:.75rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--accent)}.page-header h1{font-size:clamp(1.75rem,3vw,2.25rem);margin-bottom:8px}.page-subtitle{margin:0;color:var(--muted);max-width:56ch}.page-body{padding:24px 32px 40px}.page-stack{display:grid;gap:20px;max-width:1080px}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:24px}.panel-header{margin-bottom:20px}.panel-header-split{display:flex;flex-wrap:wrap;align-items:flex-start;justify-content:space-between;gap:16px}.panel-title{font-size:1.25rem;margin-bottom:4px}.panel-description{margin:0;color:var(--muted);font-size:.92rem}.form-grid,.book-form{display:grid;gap:16px}.form-grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.form-section{display:grid;gap:14px;padding-top:4px}.form-section+.form-section{border-top:1px solid var(--border);padding-top:20px;margin-top:4px}.form-section-title{font-family:Inter,sans-serif;font-size:.78rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}.form-row-inline{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end}.form-field-grow{flex:1;min-width:220px}.form-actions{display:flex;justify-content:flex-end;padding-top:8px}label{display:grid;gap:6px;font-size:.88rem;font-weight:500;color:var(--ink-secondary)}input,textarea,select{width:100%;border:1px solid var(--border);border-radius:var(--radius);padding:11px 13px;background:var(--surface);color:var(--ink);transition:border-color .15s ease,box-shadow .15s ease}input::placeholder,textarea::placeholder{color:#94a3b8}input:focus,textarea:focus,select:focus{outline:none;border-color:#93c5fd;box-shadow:0 0 0 3px #2563eb1f}textarea{min-height:120px;resize:vertical}.btn{border:1px solid transparent;border-radius:var(--radius);padding:10px 16px;cursor:pointer;font-weight:500;font-size:.92rem;transition:background .15s ease,border-color .15s ease,color .15s ease}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-block{width:100%}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){background:var(--accent-hover)}.btn-secondary{background:var(--surface);border-color:var(--border-strong);color:var(--ink)}.btn-secondary:hover:not(:disabled){background:var(--surface-muted)}.btn-ghost{background:transparent;color:var(--sidebar-text);border-color:transparent}.btn-ghost:hover:not(:disabled){background:#ffffff0f;color:#e2e8f0}.btn-small{padding:7px 12px;font-size:.84rem}.btn-danger{background:var(--danger);color:#fff;border-color:var(--danger)}.btn-danger:hover:not(:disabled){background:var(--danger-hover)}.alert{padding:12px 14px;border-radius:var(--radius);font-size:.92rem}.alert-error{background:var(--error-soft);color:#991b1b;border:1px solid #fecaca}.alert-success{background:var(--success-soft);color:var(--success);border:1px solid #a7f3d0}.error,.success{font-size:.92rem}.error{color:#991b1b}.success{color:var(--success)}.shelf-filters{display:flex;flex-wrap:wrap;gap:8px}.chip{border:1px solid var(--border);background:var(--surface-muted);border-radius:999px;padding:7px 14px;cursor:pointer;font-size:.86rem;font-weight:500;color:var(--ink-secondary);transition:all .15s ease}.chip:hover{border-color:var(--border-strong)}.chip.active{background:var(--accent-soft);color:var(--accent);border-color:#bfdbfe}.badge{display:inline-flex;align-items:center;padding:2px 8px;border-radius:999px;background:var(--accent-soft);color:var(--accent);font-size:.75rem;font-weight:600}.badge-subtle{background:var(--surface-muted);color:var(--ink-secondary)}.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:20px}.book-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;transition:transform .18s ease,box-shadow .18s ease}.book-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.book-cover{aspect-ratio:3 / 4;background:linear-gradient(180deg,#e2e8f0,#f8fafc);display:grid;place-items:center}.book-cover img{width:100%;height:100%;object-fit:cover}.book-cover-fallback{color:var(--muted);font-size:.85rem;font-weight:500}.book-info{padding:14px}.book-info h3{font-family:Inter,sans-serif;font-size:.98rem;font-weight:600;line-height:1.35;margin-bottom:6px}.book-author{margin:0 0 10px;color:var(--muted);font-size:.88rem}.book-meta{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:12px}.book-isbn{font-size:.76rem;color:var(--muted)}.book-list{list-style:none;margin:0;padding:0;display:grid;gap:10px}.book-list-item{display:flex;align-items:center;gap:14px;padding:14px;background:var(--surface-muted);border:1px solid var(--border);border-radius:var(--radius);transition:border-color .15s ease}.book-list-item:hover{border-color:var(--border-strong)}.book-list-thumb{width:48px;height:64px;flex-shrink:0;border-radius:6px;overflow:hidden;background:#e2e8f0;display:grid;place-items:center}.book-list-thumb img{width:100%;height:100%;object-fit:cover}.thumb-fallback{width:18px;height:22px;border:2px solid #94a3b8;border-radius:2px;display:block}.book-list-info{flex:1;min-width:0}.book-list-info strong{display:block;margin-bottom:4px;font-size:.95rem}.book-list-info p{margin:0;color:var(--muted);font-size:.85rem}.book-list-actions{display:flex;flex-wrap:wrap;gap:8px;flex-shrink:0}.pagination{display:flex;align-items:center;justify-content:center;gap:12px;margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}.pagination-info{color:var(--muted);font-size:.88rem;min-width:120px;text-align:center}.image-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}.image-picker{border:1px dashed var(--border-strong);border-radius:var(--radius-lg);min-height:220px;display:block;position:relative;cursor:pointer;background:var(--surface-muted);overflow:hidden;transition:border-color .15s ease,background .15s ease}.image-picker:hover{border-color:#93c5fd;background:var(--accent-soft)}.image-picker img{display:block;width:100%;min-height:220px;max-height:320px;object-fit:cover}.image-picker-placeholder{min-height:220px;display:grid;place-items:center;padding:20px;text-align:center;gap:8px}.image-picker-placeholder p{margin:0;color:var(--muted);font-size:.86rem}.image-picker-icon{width:40px;height:40px;border-radius:50%;background:#dbeafe;position:relative}.image-picker-icon:before{content:"";position:absolute;top:11px;right:10px;bottom:10px;left:11px;border:2px solid var(--accent);border-radius:4px}.image-picker input{display:none}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a80;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:grid;place-items:center;padding:20px;z-index:1000}.modal-panel{width:min(100%,560px);max-height:90vh;overflow:auto;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:24px}.modal-panel-lg{width:min(100%,720px)}.modal-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:8px}.modal-header h2{font-size:1.35rem}.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:8px}.book-search{display:flex;flex-direction:column;gap:12px;margin-bottom:20px}.search-mode{display:flex;flex-wrap:wrap;gap:8px}.book-search-form{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.book-search-form input[type=search]{flex:1 1 220px;min-width:0;padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);color:var(--ink)}.auth-shell{min-height:100vh;display:grid;grid-template-columns:1.1fr 1fr}.auth-shell-compact{grid-template-columns:1fr}.auth-showcase{background:linear-gradient(160deg,#0f172a,#1e3a8a);color:#fff;display:grid;place-items:center;padding:48px}.auth-showcase-inner{max-width:420px}.auth-logo{margin-bottom:24px}.auth-showcase h1{font-size:2.25rem;margin-bottom:16px}.auth-showcase p{color:#cbd5e1;font-size:1.05rem;line-height:1.6}.auth-features{margin:28px 0 0;padding:0;list-style:none;display:grid;gap:12px}.auth-features li{padding-left:20px;position:relative;color:#e2e8f0}.auth-features li:before{content:"";position:absolute;left:0;top:.55em;width:8px;height:8px;border-radius:50%;background:#60a5fa}.auth-panel{display:grid;place-items:center;padding:32px 24px;background:var(--bg)}.auth-panel-full{min-height:100vh}.auth-card{width:min(100%,420px);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:32px}.auth-card h2{font-size:1.75rem;margin-bottom:8px}.auth-lead{margin:0 0 24px;color:var(--muted)}.auth-back{margin-bottom:16px;padding-left:0;color:var(--muted)}.empty-state{text-align:center;color:var(--muted);padding:56px 20px}.empty-state-compact{padding:32px 20px}.empty-state h3{font-family:Inter,sans-serif;font-size:1.05rem;color:var(--ink);margin-bottom:8px}.empty-state p{margin:0}.empty-state-icon{width:56px;height:56px;margin:0 auto 16px;border-radius:14px;background:var(--surface-muted);border:1px solid var(--border);position:relative}.empty-state-icon:before{content:"";position:absolute;top:16px;right:18px;bottom:16px;left:18px;border:2px solid #cbd5e1;border-radius:3px}@media(max-width:960px){.dashboard{grid-template-columns:1fr}.sidebar{position:static;height:auto;padding:16px}.sidebar-nav{grid-template-columns:1fr 1fr}.sidebar-footer{display:none}.auth-shell{grid-template-columns:1fr}.auth-showcase{display:none}}@media(max-width:640px){.page-header,.page-body{padding-left:16px;padding-right:16px}.panel{padding:18px}.form-grid-2{grid-template-columns:1fr}.book-list-item{flex-wrap:wrap}.book-list-actions{width:100%;justify-content:flex-end}.sidebar-nav{grid-template-columns:1fr}}