:root{--primary-color: #4a6fa5;--primary-hover: #3d5d8a;--secondary-color: #7a8b99;--accent-color: #e8b86d;--success-color: #5a9a6b;--warning-color: #d4a84b;--danger-color: #c25a5a;--info-color: #5a8ac2;--bg-primary: #fafafa;--bg-secondary: #f0f2f5;--bg-tertiary: #e4e6eb;--bg-card: #ffffff;--text-primary: #1c1e21;--text-secondary: #606770;--text-muted: #8a8d91;--text-light: #ffffff;--border-color: #dddfe2;--border-light: #ebedf0;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .1);--shadow-md: 0 2px 8px rgba(0, 0, 0, .1);--shadow-lg: 0 4px 16px rgba(0, 0, 0, .15);--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--sidebar-width: 260px;--sidebar-width-mobile: 280px;--header-height: 60px;--header-height-mobile: 56px;--touch-target-min: 44px;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;--font-size-sm: 12px;--font-size-md: 14px;--font-size-lg: 16px;--font-size-xl: 20px;--font-size-xxl: 24px;--transition-fast: .15s ease;--transition-normal: .25s ease}@media (prefers-color-scheme: dark){:root{--bg-primary: #18191a;--bg-secondary: #242526;--bg-tertiary: #3a3b3c;--bg-card: #2d2d2d;--text-primary: #e4e6eb;--text-secondary: #b0b3b8;--text-muted: #65676b;--border-color: #3a3b3c;--border-light: #484a4d;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--shadow-md: 0 2px 8px rgba(0, 0, 0, .3);--shadow-lg: 0 4px 16px rgba(0, 0, 0, .4)}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);font-size:var(--font-size-md);font-family:var(--font-family);font-weight:500;border:none;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);text-decoration:none}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary:hover:not(:disabled){background:var(--primary-hover)}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary)}.btn-secondary:hover:not(:disabled){background:var(--border-color)}.btn-success{background:var(--success-color);color:var(--text-light)}.btn-danger{background:var(--danger-color);color:var(--text-light)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover:not(:disabled){background:var(--bg-tertiary);color:var(--text-primary)}.btn-sm{padding:var(--spacing-xs) var(--spacing-sm);font-size:var(--font-size-sm)}.btn-lg{padding:var(--spacing-md) var(--spacing-lg);font-size:var(--font-size-lg)}.form-label{display:block;margin-bottom:var(--spacing-xs);font-size:var(--font-size-sm);font-weight:500;color:var(--text-secondary)}.form-input,.form-select,.form-textarea{width:100%;padding:var(--spacing-sm) var(--spacing-md);font-size:var(--font-size-md);font-family:var(--font-family);color:var(--text-primary);background:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-sm);transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.form-input:focus,.form-select:focus,.form-textarea:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #4a6fa526}.form-textarea{resize:vertical;min-height:80px}.form-checkbox{display:flex;align-items:center;gap:var(--spacing-sm);cursor:pointer}.form-checkbox input{width:18px;height:18px;accent-color:var(--primary-color)}.form-error{color:var(--danger-color);font-size:var(--font-size-sm);margin-top:var(--spacing-xs)}.card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);overflow:hidden}.card-header{padding:var(--spacing-md);border-bottom:1px solid var(--border-light);font-weight:600;font-size:var(--font-size-lg);color:var(--text-primary)}.card-body{padding:var(--spacing-md)}.card-footer{padding:var(--spacing-md);border-top:1px solid var(--border-light);background:var(--bg-secondary)}.tag{display:inline-flex;align-items:center;gap:var(--spacing-xs);padding:2px var(--spacing-sm);font-size:var(--font-size-sm);border-radius:var(--radius-sm);background:var(--bg-tertiary);color:var(--text-secondary)}.tag-success{background:#5a9a6b26;color:var(--success-color)}.tag-warning{background:#d4a84b26;color:var(--warning-color)}.tag-danger{background:#c25a5a26;color:var(--danger-color)}.tag-remove{cursor:pointer;opacity:.7}.tag-remove:hover{opacity:1}.status-badge{display:inline-flex;align-items:center;padding:2px var(--spacing-sm);font-size:var(--font-size-sm);font-weight:500;border-radius:var(--radius-sm);text-transform:uppercase;letter-spacing:.5px}.status-unread{background:var(--bg-tertiary);color:var(--text-muted)}.status-reading{background:#d4a84b26;color:var(--warning-color)}.status-read{background:#5a9a6b26;color:var(--success-color)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;opacity:0;visibility:hidden;transition:opacity var(--transition-normal),visibility var(--transition-normal)}.modal{background:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);width:90%;max-width:500px;max-height:90vh;overflow:auto;transform:translateY(-20px);transition:transform var(--transition-normal)}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md) var(--spacing-lg);border-bottom:1px solid var(--border-light)}.modal-title{font-size:var(--font-size-xl);font-weight:600;color:var(--text-primary)}.modal-close{background:none;border:none;font-size:24px;color:var(--text-muted);cursor:pointer;padding:0;line-height:1}.modal-body{padding:var(--spacing-lg)}.modal-footer{display:flex;justify-content:flex-end;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-lg);border-top:1px solid var(--border-light);background:var(--bg-secondary)}.empty-state{text-align:center;padding:var(--spacing-xl);color:var(--text-muted)}.empty-state-text{font-size:var(--font-size-md)}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.gap-md{gap:var(--spacing-md)}.mt-sm{margin-top:var(--spacing-sm)}.mb-sm{margin-bottom:var(--spacing-sm)}.text-sm{font-size:var(--font-size-sm)}@media (max-width: 1023px){.btn:not(.btn-sm){min-height:var(--touch-target-min)}.form-input,.form-select,.form-textarea{font-size:16px;min-height:var(--touch-target-min)}.form-checkbox{min-height:var(--touch-target-min)}.form-checkbox input{width:20px;height:20px}.modal-close{width:var(--touch-target-min);height:var(--touch-target-min);display:flex;align-items:center;justify-content:center}.autocomplete-item{min-height:var(--touch-target-min);display:flex;align-items:center}.list-item,.nav-item{min-height:var(--touch-target-min)}}:root{--primary-color: #4a6fa5;--bg-primary: #fafafa;--bg-secondary: #f0f2f5;--bg-card: #ffffff;--text-primary: #1c1e21;--text-secondary: #606770;--text-muted: #8a8d91;--text-light: #ffffff;--border-color: #dddfe2;--sidebar-width: 260px;--sidebar-width-mobile: 280px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-size-md: 14px;--font-size-lg: 16px;--font-size-xl: 18px;--font-size-xxl: 20px;--radius-md: 8px;--transition-fast: .15s ease;--transition-normal: .25s ease;--touch-target-min: 44px}@media (prefers-color-scheme: dark){:root{--bg-primary: #18191a;--bg-secondary: #242526;--bg-card: #2d2d2d;--text-primary: #e4e6eb;--text-secondary: #b0b3b8;--text-muted: #65676b;--border-color: #3a3b3c}}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);font-size:var(--font-size-md);color:var(--text-primary);background:var(--bg-primary);-webkit-tap-highlight-color:transparent}.app-container{display:flex;min-height:100vh;min-height:100dvh}.sidebar{width:var(--sidebar-width-mobile);background:var(--bg-secondary);position:fixed;top:0;left:0;bottom:0;z-index:200;transform:translate(-100%);transition:transform .3s ease;box-shadow:none;overflow-y:auto;-webkit-overflow-scrolling:touch}.sidebar.sidebar-open{transform:translate(0);box-shadow:4px 0 16px #00000026}.sidebar-header{padding:var(--spacing-lg);border-bottom:1px solid var(--border-color);height:var(--header-height-mobile);display:flex;align-items:center;position:sticky;top:0;background:var(--bg-secondary);z-index:1}.sidebar-logo{font-size:var(--font-size-xxl);font-weight:700;color:var(--primary-color);display:flex;align-items:center;gap:var(--spacing-sm)}.sidebar-nav{padding:var(--spacing-md)}.nav-section{margin-bottom:var(--spacing-lg)}.nav-section-title{font-size:12px;font-weight:600;color:var(--text-muted);text-transform:uppercase;padding:var(--spacing-sm) var(--spacing-md);margin-bottom:var(--spacing-sm)}.nav-item{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);color:var(--text-secondary);border-radius:4px;cursor:pointer;transition:all var(--transition-fast);min-height:var(--touch-target-min)}.nav-item:hover{background:var(--bg-card);color:var(--text-primary)}.nav-item.active{background:var(--primary-color);color:var(--text-light)}.nav-item-icon{width:24px;text-align:center;flex-shrink:0}.nav-item-text{font-weight:500}.nav-item-badge{margin-left:auto;background:var(--bg-card);color:var(--text-muted);font-size:12px;padding:2px 8px;border-radius:10px}.nav-item.active .nav-item-badge{background:#fff3;color:var(--text-light)}.sidebar-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;z-index:150;opacity:0;visibility:hidden;transition:opacity .3s ease,visibility .3s ease}.sidebar-overlay.active{opacity:1;visibility:visible}.main-content{flex:1;min-height:100vh;min-height:100dvh;width:100%}.content-header{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);background:var(--bg-card);border-bottom:1px solid var(--border-color);position:sticky;top:0;z-index:50;height:var(--header-height-mobile)}.menu-toggle{display:flex;align-items:center;justify-content:center;width:var(--touch-target-min);height:var(--touch-target-min);background:transparent;border:none;border-radius:var(--radius-md);cursor:pointer;transition:background var(--transition-fast);flex-shrink:0;-webkit-tap-highlight-color:transparent}.menu-toggle:hover{background:var(--bg-secondary)}.menu-toggle-icon{display:block;width:22px;height:2px;background:var(--text-primary);position:relative;transition:background var(--transition-fast)}.menu-toggle-icon:before,.menu-toggle-icon:after{content:"";position:absolute;left:0;width:22px;height:2px;background:var(--text-primary);transition:transform var(--transition-fast)}.menu-toggle-icon:before{top:-7px}.menu-toggle-icon:after{bottom:-7px}.content-title{font-size:var(--font-size-xl);font-weight:600;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.content-body{padding:var(--spacing-md)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);font-size:var(--font-size-md);font-family:var(--font-family);font-weight:500;border:none;border-radius:4px;cursor:pointer;transition:all var(--transition-fast);min-height:var(--touch-target-min)}.btn-primary{background:var(--primary-color);color:var(--text-light)}.btn-primary:hover{background:#3d5d8a}.btn-secondary{background:var(--text-secondary);color:var(--bg-primary)}.btn-secondary:hover{background:var(--text-primary)}.btn-ghost{background:transparent;color:var(--text-secondary);min-height:auto}.btn-ghost:hover{background:#e4e6eb;color:var(--text-primary)}.btn-sm{padding:4px 8px;font-size:12px;min-height:auto}.btn-danger{background:#c25a5a;color:#fff}.btn-danger:hover{background:#a04040}.empty-state{text-align:center;padding:var(--spacing-lg);color:var(--text-muted)}.empty-state-icon{font-size:48px;margin-bottom:var(--spacing-md);opacity:.5}.empty-state-title{font-size:var(--font-size-lg);font-weight:500;color:var(--text-secondary);margin-bottom:var(--spacing-sm)}.book-grid{display:grid;grid-template-columns:1fr;gap:var(--spacing-md)}.book-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);overflow:hidden;transition:all var(--transition-fast)}.book-card:hover{box-shadow:0 2px 8px #0000001a;transform:translateY(-2px)}.book-card-header{padding:var(--spacing-md);border-bottom:1px solid var(--border-color)}.book-card-title{font-size:var(--font-size-lg);font-weight:600;margin-bottom:4px}.book-card-author{font-size:var(--font-size-md);color:var(--text-secondary)}.book-card-body{padding:var(--spacing-md)}.book-card-tags{display:flex;flex-wrap:wrap;gap:4px}.book-card-footer{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-sm) var(--spacing-md);background:var(--bg-secondary);border-top:1px solid var(--border-color)}.tag{display:inline-flex;padding:2px 8px;font-size:12px;border-radius:4px;background:#e4e6eb;color:var(--text-secondary)}.tag-primary{background:#4a6fa526;color:var(--primary-color)}.status-badge{display:inline-flex;padding:2px 8px;font-size:12px;font-weight:500;border-radius:4px;text-transform:uppercase}.status-unread{background:#e4e6eb;color:var(--text-muted)}.status-reading{background:#d4a84b26;color:#d4a84b}.status-read{background:#5a9a6b26;color:#5a9a6b}.list-group{display:flex;flex-direction:column;gap:8px}.list-item{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md);background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);min-height:var(--touch-target-min)}.list-item:hover{border-color:var(--primary-color)}.list-item-title{font-weight:500}.list-item-subtitle{font-size:12px;color:var(--text-secondary)}.list-item-actions{display:flex;gap:4px}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:flex-end;justify-content:center;z-index:1000;opacity:0;visibility:hidden;transition:opacity .25s,visibility .25s}.modal-overlay.active{opacity:1;visibility:visible}.modal{background:var(--bg-card);border-radius:var(--radius-md) var(--radius-md) 0 0;box-shadow:0 -4px 16px #00000026;width:100%;max-width:100%;max-height:90vh;overflow:auto;transform:translateY(100%);transition:transform .3s ease}.modal-overlay.active .modal{transform:translateY(0)}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md);border-bottom:1px solid var(--border-color);position:sticky;top:0;background:var(--bg-card);z-index:1}.modal-title{font-size:var(--font-size-xl);font-weight:600}.modal-close{background:none;border:none;font-size:24px;color:var(--text-muted);cursor:pointer;width:var(--touch-target-min);height:var(--touch-target-min);display:flex;align-items:center;justify-content:center}.modal-close:hover{color:var(--text-primary)}.modal-body{padding:var(--spacing-md)}.modal-footer{display:flex;justify-content:flex-end;gap:8px;padding:var(--spacing-md);border-top:1px solid var(--border-color);background:var(--bg-secondary);position:sticky;bottom:0}.form-group{margin-bottom:var(--spacing-md)}.form-label{display:block;margin-bottom:4px;font-size:12px;font-weight:500;color:var(--text-secondary)}.form-input,.form-select{width:100%;padding:var(--spacing-sm) var(--spacing-md);font-size:16px;font-family:var(--font-family);color:var(--text-primary);background:var(--bg-primary);border:1px solid var(--border-color);border-radius:4px;min-height:var(--touch-target-min)}.form-input:focus,.form-select:focus{outline:none;border-color:var(--primary-color)}.form-row{display:grid;grid-template-columns:1fr;gap:var(--spacing-md)}.form-checkbox{display:flex;align-items:center;gap:8px;margin-bottom:8px;cursor:pointer;min-height:var(--touch-target-min)}.form-checkbox input{width:20px;height:20px;accent-color:var(--primary-color)}.autocomplete-wrapper{position:relative}.autocomplete-list{position:absolute;top:100%;left:0;right:0;background:var(--bg-card);border:1px solid var(--border-color);border-radius:4px;box-shadow:0 4px 12px #00000026;z-index:100;max-height:200px;overflow-y:auto}.autocomplete-item{padding:var(--spacing-sm) var(--spacing-md);cursor:pointer;font-size:14px;min-height:var(--touch-target-min);display:flex;align-items:center}.autocomplete-item:hover{background:var(--bg-secondary)}.autocomplete-hint{padding:var(--spacing-sm) var(--spacing-md);color:var(--text-muted);font-size:12px;font-style:italic;border-top:1px solid var(--border-color)}.settings-section{margin-bottom:var(--spacing-lg)}.settings-title{font-size:var(--font-size-lg);font-weight:600;margin-bottom:var(--spacing-md);color:var(--text-primary)}.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-md)}.stat-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:var(--spacing-md);text-align:center}.stat-value{font-size:var(--font-size-xl);font-weight:700;color:var(--primary-color)}.stat-label{font-size:12px;color:var(--text-secondary);margin-top:4px}.settings-option{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:var(--spacing-md);margin-bottom:var(--spacing-md)}.theme-options{display:flex;gap:var(--spacing-sm);flex-wrap:wrap}.text-muted{color:var(--text-muted)}.text-sm{font-size:12px}.mt-md{margin-top:var(--spacing-md)}.mb-md{margin-bottom:var(--spacing-md)}.flex{display:flex}.gap-sm{gap:var(--spacing-sm)}.hidden{display:none!important}@media (min-width: 480px){.book-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}.modal{width:90%;max-width:500px;border-radius:var(--radius-md);box-shadow:0 4px 16px #00000026}.modal-overlay{align-items:center}.modal{transform:translateY(-20px)}.modal-overlay.active .modal{transform:translateY(0)}.form-row{grid-template-columns:repeat(2,1fr)}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}}@media (min-width: 1024px){.menu-toggle{display:none}.sidebar{width:var(--sidebar-width);transform:translate(0);box-shadow:none;border-right:1px solid var(--border-color)}.sidebar.sidebar-open{box-shadow:none}.sidebar-overlay{display:none}.main-content{margin-left:var(--sidebar-width)}.content-header{height:64px;padding:var(--spacing-md) var(--spacing-lg)}.content-title{font-size:var(--font-size-xl)}.content-body{padding:var(--spacing-lg)}.book-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:var(--spacing-lg)}.modal{width:90%;max-width:500px;border-radius:var(--radius-md);box-shadow:0 4px 16px #00000026}.modal-overlay{align-items:center}.modal{transform:translateY(-20px)}.modal-overlay.active .modal{transform:translateY(0)}.modal-header{padding:var(--spacing-md) var(--spacing-lg)}.modal-body{padding:var(--spacing-lg)}.modal-footer{padding:var(--spacing-md) var(--spacing-lg)}.form-row{grid-template-columns:repeat(2,1fr)}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}:root{--font-size-xl: 20px;--font-size-xxl: 24px}.sidebar-header{height:64px}}