:root{--bg: #0f1420;--panel: #182031;--panel-2: #1f2940;--line: #2a3550;--text: #e6ebf5;--muted: #8b97b0;--accent: #4f8cff;--danger: #e0555a;--ok: #3fbf7f;--radius: 10px}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);font-size:14px}h1{font-size:22px;margin:0 0 16px}h2{font-size:16px;margin:0 0 12px}h3{font-size:14px;margin:16px 0 8px;color:var(--muted)}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.muted{color:var(--muted)}.error{background:#e0555a1f;color:var(--danger);padding:10px 12px;border-radius:8px;margin:10px 0}.warn-text{color:var(--danger);font-weight:600}.ok{background:#3fbf7f1f;color:var(--ok);padding:10px 12px;border-radius:8px;margin:10px 0}.topbar{display:flex;align-items:center;gap:24px;padding:12px 24px;background:var(--panel);border-bottom:1px solid var(--line)}.brand{font-weight:700}.topnav{display:flex;gap:16px}.topbar-right{margin-left:auto;display:flex;align-items:center;gap:12px}.wrap{max-width:1000px;margin:0 auto;padding:24px}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin:16px 0}input,select{background:var(--panel-2);border:1px solid var(--line);color:var(--text);padding:8px 10px;border-radius:8px;font-size:14px;width:100%}input[type=checkbox]{width:auto}label{display:block;margin:10px 0 4px;color:var(--muted)}label.chk{display:flex;align-items:center;gap:8px}.btn{background:var(--panel-2);border:1px solid var(--line);color:var(--text);padding:8px 14px;border-radius:8px;cursor:pointer;font-size:14px}.btn:hover{border-color:var(--accent)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff;margin-top:14px}.btn.danger{background:var(--danger);border-color:var(--danger);color:#fff}.btn.ghost{background:transparent}.btn-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin:12px 0}.inline-form{display:inline-flex;align-items:center;gap:8px;flex-wrap:wrap}.tbl{width:100%;border-collapse:collapse}.tbl th,.tbl td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line)}.tbl th{color:var(--muted);font-weight:600}.tbl td.sub-on{color:var(--ok);font-weight:700}.tbl td.sub-off{color:var(--muted)}.search{max-width:360px;margin-bottom:0}.search-row{display:flex;align-items:center;gap:12px;margin-bottom:16px}.search-pending{font-size:12px}.pager{display:flex;align-items:center;gap:16px;margin-top:16px}.stat-row{display:flex;flex-wrap:wrap;gap:12px}.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:16px 20px;min-width:120px}.stat-value{font-size:24px;font-weight:700}.stat-label{color:var(--muted);font-size:12px;margin-top:4px;text-transform:capitalize}.bars{display:flex;align-items:flex-end;gap:4px;height:140px}.bar-col{display:flex;flex-direction:column;align-items:center;justify-content:flex-end;flex:1;height:100%}.bar{width:100%;background:var(--accent);border-radius:3px 3px 0 0;min-height:2px}.bar-label{font-size:9px;color:var(--muted);margin-top:4px;transform:rotate(-45deg);white-space:nowrap}.lvl-row{display:flex;align-items:center;gap:12px;margin:6px 0}.lvl-row span{min-width:120px}.lvl-row input{width:100px}.pre{background:var(--bg);padding:12px;border-radius:8px;overflow-x:auto;font-size:12px}.discount{margin-top:12px}textarea.ta{background:var(--panel-2);border:1px solid var(--line);color:var(--text);padding:8px 10px;border-radius:8px;font-size:14px;width:100%;resize:vertical;line-height:1.45;font-family:inherit}.mono,textarea.ta.mono,input.mono{font-family:ui-monospace,SFMono-Regular,SF Mono,Menlo,Consolas,monospace;font-size:13px}.filter-bar{position:sticky;top:0;z-index:5;display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding:12px 0;margin-bottom:8px;background:var(--bg)}.filter-bar select{width:auto;min-width:160px}.filter-bar .search{flex:1;min-width:200px}.tbl-wrap{overflow-x:auto}.badge{display:inline-block;white-space:nowrap;background:var(--panel-2);border:1px solid var(--line);border-radius:999px;padding:3px 10px;font-size:12px;color:var(--muted)}.chip{display:inline-block;border-radius:6px;padding:2px 8px;font-size:12px;border:1px solid var(--line);background:var(--panel-2)}.chip-code{border-color:var(--accent);color:var(--accent)}.chip-sql{border-color:var(--ok);color:var(--ok)}.chip-mcq{border-color:#b58cff;color:#b58cff}.task-head{display:flex;align-items:flex-start;gap:16px}.task-head>:last-child{margin-left:auto}.task-title{margin:8px 0 2px}.meta-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px;margin-bottom:12px}.meta{display:flex;flex-direction:column;gap:2px}.meta-label{color:var(--muted);font-size:12px}.pair-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.bilingual+.bilingual{margin-top:8px}.opt-head{margin-top:8px}.opt-row{display:grid;grid-template-columns:24px 1fr 1fr 36px;align-items:center;gap:10px;margin:6px 0}.opt-row input[type=radio]{width:auto}.tabs{display:flex;gap:6px;margin-bottom:8px}.tab{background:var(--panel-2);border:1px solid var(--line);color:var(--muted);padding:6px 14px;border-radius:8px;cursor:pointer;font-size:13px}.tab.on{color:var(--text);border-color:var(--accent)}.tests-tbl td{vertical-align:top}.tests-tbl td input[type=number]{width:60px}.save-bar{position:sticky;bottom:0;z-index:5;display:flex;align-items:center;gap:12px;padding:12px 0;margin-top:16px;background:var(--bg);border-top:1px solid var(--line)}.save-bar .save-btn{margin-top:0}.save-bar>:nth-child(2){margin-left:auto}.dirty{color:var(--accent);font-weight:600}.field-err{color:var(--danger);font-size:12px;margin:4px 0 0}.warn{background:#e0aa551f;color:#e0aa55;padding:10px 12px;border-radius:8px;margin:10px 0}.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center}.login-card{width:340px}.login-card h1{text-align:center}