:root{--bg-primary: #0a0e1a;--bg-secondary: #111827;--bg-card: #1a2035;--bg-card-hover: #1f2845;--bg-input: #0d1225;--border: #1e293b;--border-focus: #6366f1;--text-primary: #f1f5f9;--text-secondary: #94a3b8;--text-muted: #64748b;--accent: #6366f1;--accent-hover: #818cf8;--accent-glow: rgba(99, 102, 241, .25);--success: #10b981;--success-bg: rgba(16, 185, 129, .12);--warning: #f59e0b;--warning-bg: rgba(245, 158, 11, .12);--danger: #ef4444;--danger-bg: rgba(239, 68, 68, .12);--danger-hover: #dc2626;--rarity-common: #94a3b8;--rarity-common-bg: rgba(148, 163, 184, .1);--rarity-epic: #a855f7;--rarity-epic-bg: rgba(168, 85, 247, .12);--rarity-legendary: #f59e0b;--rarity-legendary-bg: rgba(245, 158, 11, .12);--state-new: #6366f1;--state-new-bg: rgba(99, 102, 241, .12);--state-learning: #f59e0b;--state-learning-bg: rgba(245, 158, 11, .12);--state-review: #10b981;--state-review-bg: rgba(16, 185, 129, .12);--state-relearning: #ef4444;--state-relearning-bg: rgba(239, 68, 68, .12);--radius: 10px;--radius-lg: 14px;--sidebar-width: 260px;--font: "Inter", -apple-system, BlinkMacSystemFont, sans-serif}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html,body,#root{height:100%}body{font-family:var(--font);background:var(--bg-primary);color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased}.app-layout{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-width);background:var(--bg-secondary);border-right:1px solid var(--border);padding:24px 16px;display:flex;flex-direction:column;gap:6px;position:fixed;top:0;left:0;bottom:0;z-index:50}.sidebar-brand{font-size:20px;font-weight:800;color:var(--accent);padding:8px 12px 20px;letter-spacing:-.5px;border-bottom:1px solid var(--border);margin-bottom:12px}.sidebar-brand span{color:var(--text-muted);font-weight:400;font-size:12px;display:block;margin-top:2px;letter-spacing:0}.sidebar a{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius);color:var(--text-secondary);text-decoration:none;font-size:14px;font-weight:500;transition:all .15s ease}.sidebar a:hover{background:var(--bg-card);color:var(--text-primary)}.sidebar a.active{background:var(--accent-glow);color:var(--accent-hover)}.sidebar-icon{font-size:18px;width:24px;text-align:center}.main-content{flex:1;margin-left:var(--sidebar-width);padding:32px 40px;max-width:1200px}.page-header{margin-bottom:32px}.page-header h1{font-size:28px;font-weight:700;letter-spacing:-.5px;margin-bottom:4px}.page-header p{color:var(--text-muted);font-size:14px}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-bottom:32px}.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px 24px;transition:transform .15s ease,border-color .15s ease}.stat-card:hover{transform:translateY(-2px);border-color:var(--accent)}.stat-card .stat-label{font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--text-muted);margin-bottom:6px}.stat-card .stat-value{font-size:32px;font-weight:800;color:var(--text-primary);letter-spacing:-1px}.stat-card .stat-icon{font-size:28px;margin-bottom:8px}.data-table{width:100%;border-collapse:collapse;background:var(--bg-card);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border)}.data-table th{background:var(--bg-secondary);padding:12px 16px;text-align:left;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.7px;color:var(--text-muted);border-bottom:1px solid var(--border)}.data-table td{padding:14px 16px;font-size:14px;border-bottom:1px solid var(--border);color:var(--text-secondary);vertical-align:middle}.data-table tr:last-child td{border-bottom:none}.data-table tr:hover td{background:var(--bg-card-hover)}.data-table .row-clickable{cursor:pointer}.badge{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;border-radius:20px;font-size:11px;font-weight:700;letter-spacing:.3px;text-transform:uppercase}.badge-common{background:var(--rarity-common-bg);color:var(--rarity-common)}.badge-epic{background:var(--rarity-epic-bg);color:var(--rarity-epic)}.badge-legendary{background:var(--rarity-legendary-bg);color:var(--rarity-legendary)}.badge-new{background:var(--state-new-bg);color:var(--state-new)}.badge-learning{background:var(--state-learning-bg);color:var(--state-learning)}.badge-review{background:var(--state-review-bg);color:var(--state-review)}.badge-relearning{background:var(--state-relearning-bg);color:var(--state-relearning)}.badge-system{background:var(--accent-glow);color:var(--accent-hover)}.btn{display:inline-flex;align-items:center;gap:6px;padding:9px 18px;border:none;border-radius:var(--radius);font-family:var(--font);font-size:13px;font-weight:600;cursor:pointer;transition:all .15s ease;text-decoration:none}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover);box-shadow:0 0 20px var(--accent-glow)}.btn-danger{background:var(--danger-bg);color:var(--danger);border:1px solid transparent}.btn-danger:hover{background:var(--danger);color:#fff}.btn-ghost{background:transparent;color:var(--text-secondary);border:1px solid var(--border)}.btn-ghost:hover{background:var(--bg-card);color:var(--text-primary);border-color:var(--text-muted)}.btn-sm{padding:5px 12px;font-size:12px}.btn-group{display:flex;gap:8px}.form-group{margin-bottom:18px}.form-group label{display:block;font-size:12px;font-weight:600;color:var(--text-secondary);margin-bottom:6px;text-transform:uppercase;letter-spacing:.5px}.form-input,.form-textarea,.form-select{width:100%;padding:10px 14px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius);color:var(--text-primary);font-family:var(--font);font-size:14px;transition:border-color .15s ease,box-shadow .15s ease;outline:none}.form-input:focus,.form-textarea:focus,.form-select:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px var(--accent-glow)}.form-textarea{min-height:120px;resize:vertical}.form-input::placeholder,.form-textarea::placeholder{color:var(--text-muted)}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}.panel{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;margin-bottom:24px}.panel-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.panel-header h2{font-size:18px;font-weight:700;letter-spacing:-.3px}.collection-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}.card-item{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);padding:16px;transition:border-color .15s ease,transform .15s ease}.card-item:hover{border-color:var(--accent);transform:translateY(-1px)}.card-item .card-front{font-size:15px;font-weight:600;color:var(--text-primary);margin-bottom:4px}.card-item .card-back{font-size:13px;color:var(--text-muted);margin-bottom:10px}.card-item .card-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.card-item .card-meta-text{font-size:11px;color:var(--text-muted)}.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh;background:var(--bg-primary)}.login-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:40px;width:100%;max-width:400px;text-align:center}.login-card h1{font-size:24px;font-weight:800;color:var(--accent);margin-bottom:6px}.login-card p{color:var(--text-muted);font-size:13px;margin-bottom:28px}.login-card .form-input{text-align:center;font-size:16px;letter-spacing:2px}.login-card .btn{width:100%;justify-content:center;padding:12px;font-size:14px;margin-top:12px}.empty-state{text-align:center;padding:48px 24px;color:var(--text-muted)}.empty-state .empty-icon{font-size:48px;margin-bottom:12px}.empty-state p{font-size:14px}.loading{display:flex;align-items:center;justify-content:center;padding:48px;color:var(--text-muted);font-size:14px;gap:10px}.spinner{width:20px;height:20px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.error-msg{background:var(--danger-bg);color:var(--danger);padding:10px 16px;border-radius:var(--radius);font-size:13px;margin-bottom:16px;border:1px solid rgba(239,68,68,.2)}.success-msg{background:var(--success-bg);color:var(--success);padding:10px 16px;border-radius:var(--radius);font-size:13px;margin-bottom:16px;border:1px solid rgba(16,185,129,.2)}.search-bar{position:relative;margin-bottom:20px}.search-bar .search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--text-muted);font-size:14px}.search-bar input{width:100%;padding:10px 14px 10px 38px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius);color:var(--text-primary);font-family:var(--font);font-size:14px;outline:none;transition:border-color .15s ease,box-shadow .15s ease}.search-bar input:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px var(--accent-glow)}.back-link{display:inline-flex;align-items:center;gap:6px;color:var(--text-muted);text-decoration:none;font-size:13px;font-weight:500;margin-bottom:20px;transition:color .15s}.back-link:hover{color:var(--accent-hover)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:100}.modal{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:32px;width:100%;max-width:520px;max-height:80vh;overflow-y:auto}.modal h2{font-size:20px;font-weight:700;margin-bottom:20px}.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:24px}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--bg-primary)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.text-mono{font-family:SF Mono,Cascadia Code,Consolas,monospace;font-size:12px}.text-right{text-align:right}.text-center{text-align:center}.mt-4{margin-top:16px}.mb-4{margin-bottom:16px}.flex{display:flex}.flex-between{display:flex;justify-content:space-between;align-items:center}.gap-2{gap:8px}.gap-3{gap:12px}