:root{--navy:#0b1b3a;--b:#2f6fed;--p:#7c3aed;--bd:#dfe4ee;--bg:#f4f6fb;--ok:#16a34a;--red:#dc2626}
*{box-sizing:border-box}body{margin:0;font:15px/1.5 Inter,system-ui,Segoe UI,sans-serif;background:var(--bg);color:#1c2330}
.top{display:flex;align-items:center;gap:20px;padding:10px 24px;background:linear-gradient(90deg,var(--navy),#1b2a6b);color:#fff;position:sticky;top:0;z-index:9;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:700;font-size:18px}.brand img{width:42px;height:42px}.brand small{display:block;font-weight:400;font-size:11px;opacity:.8}
.top nav{flex:1;display:flex;gap:6px}.top nav a{color:#dbe4ff;text-decoration:none;padding:6px 12px;border-radius:6px}.top nav a:hover{background:rgba(255,255,255,.13)}
main{max-width:1060px;margin:22px auto;padding:0 16px}h1,h2,h3{color:var(--navy);margin:.3em 0 .6em}
.card{background:#fff;border:1px solid var(--bd);border-radius:12px;padding:18px;margin:14px 0;box-shadow:0 1px 3px rgba(16,24,40,.06)}
.btn,button{font:inherit;padding:8px 14px;border-radius:8px;border:1px solid var(--bd);background:#fff;cursor:pointer;color:inherit;text-decoration:none;display:inline-block}
.btn.p,button.p{background:linear-gradient(135deg,var(--b),var(--p));color:#fff;border:0}.btn.ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}button:disabled{opacity:.45;cursor:not-allowed}
input,select,textarea{font:inherit;padding:8px 10px;border:1px solid var(--bd);border-radius:8px;width:100%;background:#fff}
label{display:block;font-size:13px;font-weight:600;color:#475069}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:8px 0}
table{width:100%;border-collapse:collapse}th{text-align:left;background:#eef1f8;color:#475069;font-size:13px}td,th{padding:9px 10px;border-bottom:1px solid var(--bd)}
.flash{background:#e8f7ee;border:1px solid #b6e3c6;padding:10px 14px;border-radius:8px;margin-top:12px}.err{color:var(--red);font-size:13px}.note{font-size:13px;color:#667}
.pg button{min-width:38px;background:var(--b);color:#fff;border:0;margin:2px}.pg button.ok{background:var(--ok)}.pg button.cur{outline:3px solid var(--navy)}
.tag{padding:2px 10px;border-radius:99px;font-size:12px;background:#eef1f8}.tag.g{background:#dcfce7;color:#166534}
.mk{position:relative;padding:14px;background:#fff;border:1px solid var(--bd);border-radius:8px;min-height:140px;user-select:none}
.mark{position:absolute;color:#e00;font:bold 28px sans-serif;transform:translate(-50%,-50%);pointer-events:none}
#timer{font:bold 28px ui-monospace,monospace;color:var(--ok)}#timer.low{color:var(--red)}
.ro{background:#f8f9fc;border:1px dashed var(--bd);border-radius:8px;padding:12px;margin:8px 0}
.login{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px;margin-top:30px}.hero{text-align:center;margin-top:30px}.hero img{width:110px}
.score{font-size:22px;font-weight:700;color:var(--red)}.ok-t{color:var(--ok);font-weight:700}
.ql-formula{font-family:monospace;font-style:italic;background:#f1f5f9;padding:1px 4px;border-radius:3px}
.ql-editor table{width:100%;border-collapse:collapse;margin:8px 0;table-layout:fixed}
.ql-editor th,.ql-editor td{border:1px solid #cbd5e1;padding:6px 8px;word-break:break-word}
.ql-editor th{background:#f1f5f9}
.ql-editor img{max-width:100%;height:auto}

/* Compact Bordered Table Grids */
.table-grid{width:100%;border-collapse:collapse;border:1px solid #cbd5e1;font-size:13px;background:#fff}
.table-grid th,.table-grid td{padding:7px 10px;border:1px solid #cbd5e1;text-align:left;vertical-align:middle}
.table-grid th{background:#f1f5f9;color:#334155;font-weight:700;font-size:12px;text-transform:uppercase;letter-spacing:0.3px;white-space:nowrap}
.table-grid tr:nth-child(even){background:#f8fafc}
.table-grid tr:hover{background:#f1f5f9}
.table-grid td.center,.table-grid th.center{text-align:center}
.table-grid td.right,.table-grid th.right{text-align:right}

/* Sortable Column Headers */
th.sortable{cursor:pointer;user-select:none;transition:background .15s}
th.sortable:hover{background:#e2e8f0}
th.sortable a{color:inherit;text-decoration:none;display:flex;align-items:center;gap:6px;justify-content:space-between}

/* Filter & Search Toolbar */
.filter-bar{background:#f8fafc;border:1px solid #cbd5e1;border-radius:8px;padding:10px 14px;margin-bottom:12px;display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.filter-bar input,.filter-bar select{padding:6px 10px;font-size:13px;border-radius:6px;border:1px solid #cbd5e1;background:#fff;width:auto}

/* Pagination Bar */
.pagination-container{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;padding:10px 14px;background:#f8fafc;border-top:1px solid #cbd5e1;font-size:13px;color:#475569}
.pagination-links{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.pagination-links a,.pagination-links span{padding:4px 9px;border:1px solid #cbd5e1;background:#fff;border-radius:5px;color:#1e293b;text-decoration:none;font-size:12.5px;font-weight:500}
.pagination-links a:hover{background:#e2e8f0}
.pagination-links .active{background:#2563eb;border-color:#2563eb;color:#ffffff;font-weight:bold}
.pagination-links .disabled{color:#94a3b8;background:#f8fafc;cursor:not-allowed;border-color:#e2e8f0}
.per-page-select{display:flex;align-items:center;gap:6px;font-size:13px;flex-wrap:wrap}