:root {
    --primary: #4F46E5;
    --primary-light: #6366F1;
    --primary-dark: #3730A3;
    --primary-bg: #EEF2FF;
    --secondary: #0EA5E9;
    --accent: #F59E0B;
    --success: #10B981;
    --danger: #EF4444;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --bg-hover: #F0F0FF;
    --border-color: #E5E7EB;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    --sidebar-width: 280px;
    --header-height: 64px;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--font-family);font-size:16px;line-height:1.5;color:var(--text-primary);background:var(--bg-secondary);min-height:100vh;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto}
.app-layout{display:flex;min-height:100vh}
.sidebar{width:var(--sidebar-width);background:var(--bg-primary);border-right:1px solid var(--border-color);position:fixed;top:0;left:0;bottom:0;z-index:100;display:flex;flex-direction:column;transition:transform .3s ease}
.sidebar-header{padding:20px;border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between}
.sidebar-logo{font-size:20px;font-weight:700;color:var(--primary);display:flex;align-items:center;gap:10px}
.sidebar-close{display:none;background:none;border:none;cursor:pointer;color:var(--text-secondary);padding:4px;font-size:24px}
.sidebar-nav{padding:16px;flex:1;overflow-y:auto}
.nav-section{margin-bottom:24px}
.nav-title{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:1px;color:var(--text-muted);padding:0 12px;margin-bottom:8px}
.nav-item{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:var(--radius-md);color:var(--text-secondary);font-size:14px;font-weight:500;transition:all .2s;cursor:pointer;margin-bottom:2px}
.nav-item:hover{background:var(--bg-hover);color:var(--text-primary)}
.nav-item.active{background:var(--primary-bg);color:var(--primary);font-weight:600}
.nav-item .badge{margin-left:auto;background:var(--bg-tertiary);color:var(--text-secondary);padding:2px 8px;border-radius:var(--radius-full);font-size:12px;font-weight:600}
.nav-item.active .badge{background:var(--primary);color:white}
.main-content{flex:1;margin-left:var(--sidebar-width);min-height:100vh}
.top-bar{background:var(--bg-primary);border-bottom:1px solid var(--border-color);padding:0 24px;height:var(--header-height);display:flex;align-items:center;gap:16px;position:sticky;top:0;z-index:50}
.hamburger{display:none;background:none;border:none;cursor:pointer;color:var(--text-secondary);padding:8px}
.top-bar-search{flex:1;max-width:500px;position:relative}
.top-bar-search input{width:100%;padding:10px 16px 10px 40px;border:1px solid var(--border-color);border-radius:var(--radius-full);background:var(--bg-secondary);font-size:14px;transition:all .2s;outline:none}
.top-bar-search input:focus{border-color:var(--primary);background:var(--bg-primary);box-shadow:0 0 0 3px var(--primary-bg)}
.top-bar-search .search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--text-muted)}
.top-bar-actions{display:flex;align-items:center;gap:12px;margin-left:auto}
.top-bar-actions .avatar{width:36px;height:36px;border-radius:50%;background:var(--primary-bg);color:var(--primary);display:flex;align-items:center;justify-content:center;font-weight:600;font-size:14px;cursor:pointer}
.page-content{padding:24px;max-width:1400px}
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin-bottom:24px}
.stat-card{background:var(--bg-primary);border-radius:var(--radius-lg);padding:20px;box-shadow:var(--shadow-sm);border:1px solid var(--border-color)}
.stat-card .stat-icon{width:40px;height:40px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;margin-bottom:12px;font-size:20px}
.stat-card .stat-value{font-size:28px;font-weight:700;line-height:1.2}
.stat-card .stat-label{font-size:13px;color:var(--text-secondary);margin-top:4px}
.stat-card .stat-progress{margin-top:12px;height:4px;background:var(--bg-tertiary);border-radius:var(--radius-full);overflow:hidden}
.stat-card .stat-progress-bar{height:100%;border-radius:var(--radius-full);transition:width .5s ease}
.bookmarks-container{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:16px}
.bookmark-card{background:var(--bg-primary);border-radius:var(--radius-lg);border:1px solid var(--border-color);overflow:hidden;transition:all .2s;position:relative}
.bookmark-card:hover{box-shadow:var(--shadow-md);border-color:var(--primary-light);transform:translateY(-1px)}
.bookmark-card .card-thumb{width:100%;height:160px;background:var(--bg-tertiary);position:relative;overflow:hidden}
.bookmark-card .card-thumb img{width:100%;height:100%;object-fit:cover}
.bookmark-card .card-thumb .fallback{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary-bg),var(--bg-tertiary));font-size:48px}
.bookmark-card .card-body{padding:16px}
.bookmark-card .card-domain{font-size:12px;color:var(--text-muted);display:flex;align-items:center;gap:6px;margin-bottom:6px}
.bookmark-card .card-title{font-size:15px;font-weight:600;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.bookmark-card .card-title a{color:inherit}
.bookmark-card .card-desc{font-size:13px;color:var(--text-secondary);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:10px}
.bookmark-card .card-tags{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:8px}
.bookmark-card .card-tags .tag{font-size:11px;padding:2px 8px;background:var(--primary-bg);color:var(--primary);border-radius:var(--radius-full);font-weight:500;cursor:pointer;transition:all .2s}
.bookmark-card .card-tags .tag:hover{background:var(--primary);color:white}
.bookmark-card .card-footer{padding:12px 16px;border-top:1px solid var(--border-light);display:flex;align-items:center;justify-content:space-between}
.bookmark-card .card-footer .date{font-size:12px;color:var(--text-muted)}
.bookmark-card .card-footer .actions{display:flex;gap:4px}
.btn-icon{width:32px;height:32px;border:none;background:transparent;cursor:pointer;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:var(--text-secondary);transition:all .2s}
.btn-icon:hover{background:var(--bg-tertiary);color:var(--text-primary)}
.btn-icon.favorite.active{color:var(--accent)}
.btn-icon.delete:hover{color:var(--danger);background:#FEF2F2}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;font-size:14px;font-weight:600;border-radius:var(--radius-md);border:1px solid transparent;cursor:pointer;transition:all .2s;white-space:nowrap;font-family:inherit}
.btn-primary{background:var(--primary);color:white;border-color:var(--primary)}
.btn-primary:hover{background:var(--primary-dark)}
.btn-secondary{background:var(--bg-primary);color:var(--text-primary);border-color:var(--border-color)}
.btn-secondary:hover{background:var(--bg-tertiary)}
.btn-danger{background:var(--danger);color:white}
.btn-sm{padding:6px 12px;font-size:13px}
.btn-block{width:100%}
.btn:disabled{opacity:.6;cursor:not-allowed}
.form-group{margin-bottom:20px}
.form-group label{display:block;font-size:14px;font-weight:600;margin-bottom:6px}
.form-group .hint{font-size:12px;color:var(--text-muted);margin-top:4px}
.form-input{width:100%;padding:10px 14px;border:1px solid var(--border-color);border-radius:var(--radius-md);font-size:14px;font-family:inherit;transition:all .2s;outline:none;background:var(--bg-primary)}
.form-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-bg)}
textarea.form-input{resize:vertical;min-height:80px}
.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:linear-gradient(135deg,var(--primary-bg),var(--bg-secondary))}
.auth-card{background:var(--bg-primary);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);padding:40px;width:100%;max-width:440px}
.auth-card .auth-header{text-align:center;margin-bottom:32px}
.auth-card .auth-header h1{font-size:24px;font-weight:700;margin-bottom:8px}
.auth-card .auth-header p{color:var(--text-secondary);font-size:14px}
.auth-footer{text-align:center;margin-top:24px;font-size:14px;color:var(--text-secondary)}
.auth-footer a{color:var(--primary);font-weight:600}
.alert{padding:12px 16px;border-radius:var(--radius-md);font-size:14px;margin-bottom:16px}
.alert-error{background:#FEF2F2;color:#991B1B;border:1px solid #FECACA}
.alert-success{background:#F0FDF4;color:#166534;border:1px solid #BBF7D0}
.alert-info{background:var(--primary-bg);color:#3730A3;border:1px solid #C7D2FE}
.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.5);backdrop-filter:blur(4px);z-index:1000;display:none;align-items:center;justify-content:center;padding:24px}
.modal-overlay.open{display:flex}
.modal{background:var(--bg-primary);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);width:100%;max-width:560px;max-height:90vh;overflow-y:auto;animation:modalSlideIn .2s ease}
@keyframes modalSlideIn{from{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}
.modal-header{padding:20px 24px;border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between}
.modal-header h2{font-size:18px;font-weight:600}
.modal-close{background:none;border:none;cursor:pointer;color:var(--text-muted);padding:4px;font-size:20px;border-radius:var(--radius-md)}
.modal-body{padding:24px}
.tag-badge{display:inline-flex;align-items:center;gap:4px;padding:4px 10px;background:var(--primary-bg);color:var(--primary);border-radius:var(--radius-full);font-size:13px;font-weight:500}
.empty-state{text-align:center;padding:60px 20px}
.empty-state .empty-icon{width:80px;height:80px;margin:0 auto 20px;background:var(--bg-tertiary);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:32px}
.empty-state h3{font-size:18px;font-weight:600;margin-bottom:8px}
.empty-state p{color:var(--text-secondary);max-width:400px;margin:0 auto 24px}
.spinner{width:24px;height:24px;border:3px solid var(--border-color);border-top-color:var(--primary);border-radius:50%;animation:spin .6s linear infinite;margin:0 auto}
.spinner-lg{width:40px;height:40px;border-width:4px}
@keyframes spin{to{transform:rotate(360deg)}}
.pagination{display:flex;align-items:center;justify-content:center;gap:4px;margin-top:24px;padding:16px 0}
.pagination .page-btn{width:36px;height:36px;border:1px solid var(--border-color);border-radius:var(--radius-md);background:var(--bg-primary);color:var(--text-secondary);font-size:14px;font-weight:500;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s}
.pagination .page-btn.active{background:var(--primary);color:white}
.toast-container{position:fixed;bottom:24px;right:24px;z-index:2000;display:flex;flex-direction:column;gap:8px}
.toast{background:var(--bg-primary);border-radius:var(--radius-md);padding:14px 20px;box-shadow:var(--shadow-lg);border:1px solid var(--border-color);min-width:300px;font-size:14px}
.toast-success{border-left:4px solid var(--success)}
.toast-error{border-left:4px solid var(--danger)}
.toast-info{border-left:4px solid var(--info)}
.admin-table{width:100%;border-collapse:collapse}
.admin-table th,.admin-table td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--border-color);font-size:14px}
.admin-table th{font-weight:600;color:var(--text-secondary);font-size:12px;text-transform:uppercase;background:var(--bg-secondary)}
@media(max-width:1024px){.sidebar{transform:translateX(-100%)}.sidebar.open{transform:translateX(0)}.hamburger{display:flex}.sidebar-close{display:flex}.main-content{margin-left:0}}
@media(max-width:768px){.page-content{padding:16px}.stats-grid{grid-template-columns:repeat(2,1fr)}.bookmarks-container{grid-template-columns:1fr}.auth-card{padding:28px 20px}}
@media(max-width:480px){.stats-grid{grid-template-columns:1fr 1fr}.stat-card{padding:14px}}
.text-center{text-align:center}
.text-muted{color:var(--text-muted)}
.mt-4{margin-top:16px}
.mt-6{margin-top:24px}
.mb-4{margin-bottom:16px}
.hidden{display:none}
/* ── Share / Multi-select ── */
.card-select{position:absolute;top:8px;right:8px;z-index:10;width:28px;height:28px;border-radius:50%;border:2px solid var(--border-color);background:rgba(255,255,255,.9);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s;opacity:0}.bookmark-card:hover .card-select,.bookmark-card.selected .card-select{opacity:1}.card-select .check-btn{font-size:14px;color:transparent;transition:color .2s}.bookmark-card.selected{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary-bg)}.bookmark-card.selected .card-select{background:var(--primary);border-color:var(--primary)}.bookmark-card.selected .card-select .check-btn{color:#fff}.card-owner{font-size:12px;color:var(--text-muted);margin-bottom:6px}.btn-secondary{background:var(--bg-primary);color:var(--text-primary);border-color:var(--border-color)}.btn-secondary:hover{background:var(--bg-tertiary)}
/* ── Notification Bell ── */
.notification-bell{position:relative;cursor:pointer;padding:8px;color:var(--text-secondary);display:flex;align-items:center;border-radius:var(--radius-md);transition:all .2s}.notification-bell:hover{background:var(--bg-tertiary);color:var(--text-primary)}.notification-badge{position:absolute;top:0;right:0;min-width:18px;height:18px;background:var(--danger);color:#fff;font-size:11px;font-weight:700;border-radius:50%;display:none;align-items:center;justify-content:center;padding:0 4px;border:2px solid var(--bg-primary)}.notification-dropdown{position:absolute;top:100%;right:0;z-index:200;width:380px;background:var(--bg-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);border:1px solid var(--border-color);display:none;max-height:480px;overflow-y:auto;margin-top:4px}.notification-dropdown.open{display:block}.notification-header{padding:14px 16px;font-size:14px;font-weight:600;border-bottom:1px solid var(--border-color)}.notification-list{padding:8px}.notification-empty{padding:24px;text-align:center;color:var(--text-muted);font-size:14px}.notification-item{padding:14px;border-bottom:1px solid var(--border-light);margin-bottom:8px;border:1px solid var(--border-color);border-radius:var(--radius-md)}.notification-item:last-child{border-bottom:none;margin-bottom:0}.notification-sender{font-size:14px;font-weight:600;margin-bottom:2px}.notification-detail{font-size:12px;color:var(--text-secondary)}.notification-preview{font-size:12px;color:var(--text-muted);margin:6px 0;line-height:1.4}.notification-actions{display:flex;gap:8px;margin-top:10px}
@media(max-width:768px){.notification-dropdown{width:calc(100vw - 32px);right:-60px}}
/* ── Sidebar backdrop (mobile) ── */
.sidebar-backdrop{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.3);z-index:99;display:none}.sidebar-backdrop.open{display:block}