:root{--teal: #0f766e;--ink: #0f172a;--muted: #64748b;--bg: #f1f5f9;--card: #ffffff;--border: #e2e8f0;--ok: #16a34a;--err: #dc2626;--blue: #2563eb;--purple: #7c3aed}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--bg)}.shell{display:grid;grid-template-columns:220px 1fr;min-height:100vh}.sidebar{background:#0b1220;color:#cbd5e1;padding:20px 14px;display:flex;flex-direction:column}.sidebar-user{margin-top:auto;padding:14px 10px 4px;border-top:1px solid #1e293b;display:grid;gap:8px;font-size:12px;overflow-wrap:anywhere}.sidebar-user button{border:0;background:none;color:#5eead4;padding:0;text-align:left;cursor:pointer}.brand{font-weight:700;color:#fff;font-size:17px;padding:6px 10px 18px}.nav-item{display:block;padding:10px 12px;border-radius:8px;color:#cbd5e1;text-decoration:none;font-size:15px}.nav-item:hover{background:#1e293b}.nav-item--active{background:var(--teal);color:#fff}.content{padding:32px 40px;max-width:1600px;width:100%}h1{margin:0 0 6px;font-size:26px}.muted{color:var(--muted)}code{background:#e2e8f0;padding:1px 6px;border-radius:4px;font-size:12px}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-top:24px}.stat-card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px;border-top:3px solid var(--teal);box-shadow:0 4px 16px #0f172a0a}.stat-value{font-size:30px;font-weight:700;color:var(--teal)}.stat-label{color:var(--muted);font-size:14px;margin-top:4px}.placeholder{margin-top:24px;padding:40px;border:2px dashed var(--border);border-radius:12px;text-align:center;color:var(--muted);background:var(--card)}.btn{background:var(--teal);color:#fff;border:none;padding:10px 18px;border-radius:8px;font-weight:600;font-size:14px;cursor:pointer}.btn:disabled{opacity:.5;cursor:not-allowed}.btn--ghost{background:#fff;color:var(--teal);border:1px solid var(--border)}.btn--danger{background:var(--err)}.btn--danger-outline{color:var(--err);background:#fff;border:1px solid #fecaca}.btn--danger-outline:hover{background:#fef2f2}.toolbar{display:flex;align-items:center;gap:12px;margin:20px 0 12px}.toolbar--wrap{flex-wrap:wrap}.page-size{margin-left:auto;display:flex;align-items:center;gap:8px;color:var(--muted);font-size:14px}.page-size select,.status-select{border:1px solid var(--border);border-radius:7px;padding:7px 9px;background:#fff}.status-select{font-weight:600}.status-select--draft{color:#92400e;background:#fffbeb;border-color:#fde68a}.status-select--published{color:#166534;background:#f0fdf4;border-color:#bbf7d0}.table-scroll{overflow-x:auto}.empty-cell{text-align:center!important;color:var(--muted);padding:28px!important}.pagination{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:0 0 24px}.pagination>div{display:flex;gap:8px}.history-section{margin-top:40px}.history-section h2{margin-bottom:4px}.alert{padding:12px 16px;border-radius:8px;margin:16px 0}.alert--error{background:#fef2f2;color:var(--err);border:1px solid #fecaca}.alert--success{background:#f0fdf4;color:var(--ok);border:1px solid #bbf7d0}.login-page{min-height:100vh;display:grid;place-items:center;padding:24px}.login-card{width:min(420px,100%);background:var(--card);border:1px solid var(--border);border-radius:14px;padding:32px;box-shadow:0 16px 40px #0f172a14;display:grid;gap:16px}.brand--login{color:var(--teal);padding:0}.login-card h1,.login-card p{margin:0}.field{display:grid;gap:7px;font-size:14px;font-weight:600}.field input{width:100%;border:1px solid var(--border);border-radius:8px;padding:11px 12px;font:inherit}.field input:focus{outline:2px solid #99f6e4;border-color:var(--teal)}@media(max-width:700px){.shell{grid-template-columns:1fr}.sidebar{min-height:auto}.sidebar nav{display:flex;gap:4px}.sidebar-user{margin-top:12px}.content{padding:24px 16px;overflow-x:auto}}.summary-row{display:flex;gap:10px;margin:20px 0 12px}.badge{padding:4px 12px;border-radius:999px;font-size:13px;font-weight:600}.badge--ok{background:#dcfce7;color:var(--ok)}.badge--err{background:#fee2e2;color:var(--err)}.table{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--border);border-radius:10px;overflow:hidden;margin:12px 0 20px;font-size:14px}.table th,.table td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--border)}.table th{background:#f8fafc;font-weight:600}.truncate{max-width:360px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.stat-card--blue{border-top-color:var(--blue)}.stat-card--blue .stat-value{color:var(--blue)}.stat-card--purple{border-top-color:var(--purple)}.stat-card--purple .stat-value{color:var(--purple)}.stat-card--amber{border-top-color:#d97706}.stat-card--amber .stat-value{color:#d97706}.stat-detail{color:var(--muted);font-size:12px;margin-top:8px}.eyebrow{color:var(--teal);font-size:12px;font-weight:800;letter-spacing:.09em;text-transform:uppercase;margin:0 0 6px}.page-header{display:flex;align-items:flex-start;justify-content:space-between;gap:24px}.page-header p:last-child{margin:6px 0 0}.refresh{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:12px}.dashboard-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(260px,1fr);gap:16px;margin:16px 0}.panel{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px;box-shadow:0 4px 16px #0f172a0a}.panel-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:18px}.panel-heading h2{font-size:17px;margin:0 0 4px}.panel-heading p{color:var(--muted);font-size:13px;margin:0}.legend{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:6px}.legend i{width:8px;height:8px;border-radius:2px;background:var(--teal)}.chart{height:205px;display:flex;align-items:flex-end;gap:8px;overflow-x:auto;border-bottom:1px solid var(--border);padding:0 4px}.chart-column{min-width:30px;height:190px;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;gap:5px}.chart-value{font-size:10px;color:var(--muted)}.chart-bar{width:20px;min-height:4px;background:linear-gradient(#14b8a6,var(--teal));border-radius:4px 4px 0 0}.chart time{font-size:9px;color:var(--muted);white-space:nowrap;transform:rotate(-38deg);height:26px}.empty-panel{min-height:190px;display:grid;place-items:center;color:var(--muted);font-size:14px}.metric-list{display:grid}.metric-list>div{display:flex;justify-content:space-between;align-items:center;padding:13px 0;border-bottom:1px solid var(--border);color:var(--muted);font-size:13px}.metric-list>div:last-child{border-bottom:0}.metric-list strong{color:var(--ink);font-size:18px}.progress{width:100px;height:7px;background:#e2e8f0;border-radius:99px;overflow:hidden}.progress span{height:100%;display:block;background:var(--teal);border-radius:inherit}.table--flush{margin:0}.badge--neutral{background:#f1f5f9;color:var(--muted)}.result-count{margin-left:auto;color:var(--muted);font-size:13px}.filter-bar{display:grid;grid-template-columns:minmax(240px,2fr) minmax(150px,1fr) minmax(150px,1fr) 90px;gap:12px;padding:16px;margin-top:22px;background:#fff;border:1px solid var(--border);border-radius:12px}.filter-bar label{display:grid;gap:6px;color:var(--muted);font-size:12px;font-weight:600}.filter-bar input,.filter-bar select{width:100%;border:1px solid var(--border);border-radius:8px;padding:9px 10px;background:#fff;color:var(--ink);font:inherit}.filter-bar input:focus,.filter-bar select:focus{outline:2px solid #99f6e4;border-color:var(--teal)}.sort-button{display:flex;align-items:center;gap:6px;padding:0;border:0;background:none;color:inherit;font:inherit;font-weight:600;cursor:pointer;white-space:nowrap}.sort-button span{color:#94a3b8;font-size:12px}.difficulty{text-transform:capitalize;padding:3px 8px;border-radius:99px;font-size:12px;font-weight:600}.difficulty--easy{color:#166534;background:#dcfce7}.difficulty--medium{color:#92400e;background:#fef3c7}.difficulty--hard{color:#991b1b;background:#fee2e2}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;display:grid;place-items:center;padding:20px;background:#0f172a9e;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.modal{width:min(480px,100%);background:#fff;border-radius:16px;padding:28px;box-shadow:0 28px 70px #0f172a4d}.modal h2{margin:14px 0 8px}.modal>p{margin:0 0 20px;color:var(--muted);line-height:1.55;font-size:14px}.danger-icon{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:#fee2e2;color:var(--err);font-size:22px;font-weight:800}.confirm-field{display:grid;gap:8px;font-size:13px;color:var(--muted)}.confirm-field input{border:1px solid var(--border);border-radius:8px;padding:11px;font:inherit}.confirm-field input:focus{outline:2px solid #fecaca;border-color:var(--err)}.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:24px}.users-filter{grid-template-columns:minmax(260px,1fr) 100px}.users-summary{display:flex;align-items:baseline;gap:7px;margin:18px 0 -2px;color:var(--muted);font-size:13px}.users-summary strong{color:var(--ink);font-size:22px}.user-cell{display:flex;align-items:center;gap:10px;min-width:210px}.user-cell>div{display:grid;gap:3px}.user-cell small{color:var(--muted);font-size:11px}.user-avatar{width:34px;height:34px;flex:0 0 auto;display:grid;place-items:center;border-radius:10px;color:#115e59;background:#ccfbf1;font-weight:800}.icon-danger-button{border:1px solid #fecaca;border-radius:7px;background:#fff;color:var(--err);padding:7px 10px;font-weight:600;cursor:pointer}.icon-danger-button:hover{background:#fef2f2}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:900px){.dashboard-grid{grid-template-columns:1fr}.filter-bar{grid-template-columns:1fr 1fr}.search-field{grid-column:1 / -1}}@media(max-width:700px){.page-header{display:grid}.refresh{flex-wrap:wrap}}@media(max-width:440px){.filter-bar{grid-template-columns:1fr}.search-field{grid-column:auto}.modal-actions{display:grid}}