/* Online NBT tests — builds on styles.css */
.nbt-main{min-height:calc(100vh - 76px);padding:40px 0 80px}
.nbt-card{background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);border-top:5px solid var(--gold);padding:32px}
.nbt-narrow{max-width:520px;margin-inline:auto}
.nbt-card h1{font-size:clamp(1.6rem,3.4vw,2.2rem);font-weight:800;margin:.3rem 0 .6rem}
.nbt-card p{color:var(--muted)}
.nbt-field{margin:18px 0 10px}
.nbt-field label{display:block;font-weight:700;font-size:.82rem;color:var(--navy);margin-bottom:6px}
.nbt-field input,.nbt-field select,.nbt-field textarea{width:100%;font:inherit;font-size:1rem;padding:13px 14px;border:1.5px solid var(--line);border-radius:12px;background:#fdfcf9;color:var(--ink)}
.nbt-field input:focus,.nbt-field select:focus,.nbt-field textarea:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 3px rgba(200,146,46,.18)}
#codeInput{font-size:1.25rem;letter-spacing:.14em;text-transform:uppercase;text-align:center;font-weight:700}
.nbt-err{color:#b3261e;font-weight:600;font-size:.9rem;margin-top:10px;min-height:1.2em}
.nbt-small{font-size:.86rem;color:var(--muted)}
.nbt-small a{color:var(--navy);font-weight:700}
.btn[disabled]{opacity:.55;cursor:not-allowed;transform:none}
.btn-block{width:100%;justify-content:center}
.btn-sm{padding:9px 16px;font-size:.82rem}

/* dashboard */
.nbt-head{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;flex-wrap:wrap;margin-bottom:26px}
.nbt-head h1{font-size:clamp(1.6rem,3.4vw,2.3rem);font-weight:800}
.nbt-meta{display:flex;gap:10px;flex-wrap:wrap}
.pill{display:inline-flex;align-items:center;gap:6px;background:var(--gold-soft);color:var(--navy);font-weight:700;font-size:.78rem;padding:6px 12px;border-radius:999px}
.pill.navy{background:var(--navy);color:#fff}
.pill.green{background:#e3f4e8;color:#17663a}.pill.red{background:#fbe5e3;color:#a12a20}.pill.grey{background:#ececec;color:#555}
.tests{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px}
.test{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:22px;display:flex;flex-direction:column;gap:10px;transition:box-shadow .2s,transform .2s}
.test:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.test .num{font-family:var(--serif);color:var(--gold);font-weight:700;letter-spacing:.1em;font-size:.8rem}
.test h3{font-size:1.15rem}
.test .info{font-size:.85rem;color:var(--muted)}
.test .best{font-size:.9rem;color:var(--navy);font-weight:700}
.test .acts{display:flex;gap:8px;flex-wrap:wrap;margin-top:auto;padding-top:6px}
.history{list-style:none;font-size:.82rem;border-top:1px dashed var(--line);padding-top:8px}
.history li{display:flex;justify-content:space-between;padding:3px 0}
.history a{color:var(--navy);font-weight:700;cursor:pointer;text-decoration:underline}

/* test taking */
.bar{position:sticky;top:76px;z-index:20;background:var(--navy);color:#fff;border-radius:16px;padding:12px 18px;display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:18px;box-shadow:var(--shadow)}
.bar b{font-weight:800}
.timer{font-variant-numeric:tabular-nums;font-weight:800;font-size:1.15rem;background:rgba(255,255,255,.12);padding:6px 12px;border-radius:10px}
.timer.low{background:#b3261e}
.qcard{background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px}
.qnum{font-weight:800;color:var(--gold);letter-spacing:.12em;font-size:.78rem;text-transform:uppercase}
.qtext{font-size:1.12rem;margin:10px 0 22px;color:var(--ink);line-height:1.7}
.opts{display:grid;gap:12px}
.opt{display:flex;align-items:center;gap:14px;text-align:left;width:100%;font:inherit;font-size:1.02rem;background:#fdfcf9;border:2px solid var(--line);border-radius:14px;padding:14px 16px;cursor:pointer;color:var(--ink);transition:border-color .15s,background .15s}
.opt:hover{border-color:var(--gold)}
.opt .l{flex:none;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-weight:800;background:var(--gold-soft);color:var(--navy)}
.opt.sel{border-color:var(--navy);background:#eef1f8}
.opt.sel .l{background:var(--navy);color:#fff}
.qnav{display:flex;justify-content:space-between;gap:10px;margin-top:22px;flex-wrap:wrap}
.saved{font-size:.82rem;color:var(--muted);min-height:1.2em;margin-top:10px}
.palette{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.palette button{width:40px;height:40px;border-radius:10px;border:2px solid var(--line);background:#fff;font-weight:700;color:var(--navy);cursor:pointer;font-family:inherit}
.palette button.done{background:var(--gold-soft);border-color:var(--gold)}
.palette button.cur{border-color:var(--navy);box-shadow:0 0 0 2px var(--navy) inset}

/* results */
.score{display:flex;align-items:center;gap:28px;flex-wrap:wrap}
.ring{--p:0;width:150px;height:150px;border-radius:50%;background:conic-gradient(var(--gold) calc(var(--p)*1%),#ece6da 0);display:grid;place-items:center;flex:none}
.ring div{width:118px;height:118px;border-radius:50%;background:var(--paper);display:grid;place-items:center;text-align:center}
.ring b{font-size:2rem;color:var(--navy);line-height:1}.ring small{display:block;color:var(--muted);font-weight:600}
.review{display:grid;gap:14px;margin-top:26px}
.rv{border:1px solid var(--line);border-left:6px solid #2e8b57;border-radius:14px;padding:18px;background:#fff}
.rv.wrong{border-left-color:#c0392b}
.rv .top{position:static;display:flex;justify-content:space-between;gap:10px;background:none;border:0;backdrop-filter:none}
.rv ol{list-style:none;display:grid;gap:6px;margin:10px 0}
.rv li{padding:8px 12px;border-radius:10px;background:#faf8f3;display:flex;gap:10px;align-items:center}
.rv li .l{font-weight:800;color:var(--navy);width:22px}
.rv li.ans{background:#e3f4e8}
.rv li.mine.bad{background:#fbe5e3}
.rv li .tag{margin-left:auto;font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.06em}
.rv .ex{font-size:.92rem;color:var(--ink);background:var(--gold-soft);border-radius:10px;padding:10px 12px}

/* modal */
.modal{position:fixed;inset:0;background:rgba(12,26,54,.55);display:none;align-items:center;justify-content:center;z-index:100;padding:16px}
.modal.open{display:flex}
.modal .box{background:#fff;border-radius:20px;max-width:440px;width:100%;padding:26px;box-shadow:var(--shadow)}
.modal .box.wide{max-width:860px;max-height:88vh;overflow:auto}
.modal h3{margin-bottom:8px}
.modal .acts{display:flex;gap:10px;justify-content:flex-end;margin-top:18px;flex-wrap:wrap}

/* admin */
.tabs{display:flex;gap:8px;margin-bottom:18px;flex-wrap:wrap}
.tabs button{font:inherit;font-weight:700;padding:10px 18px;border-radius:999px;border:2px solid var(--navy);background:transparent;color:var(--navy);cursor:pointer}
.tabs button.on{background:var(--navy);color:#fff}
.grid2{display:grid;grid-template-columns:minmax(280px,380px) 1fr;gap:22px;align-items:start}
@media(max-width:900px){.grid2{grid-template-columns:1fr}}
.tbl-wrap{overflow-x:auto;background:#fff;border-radius:18px;border:1px solid var(--line)}
table.tbl{width:100%;border-collapse:collapse;font-size:.88rem}
.tbl th{text-align:left;background:var(--navy);color:#fff;padding:10px 12px;font-size:.75rem;letter-spacing:.06em;text-transform:uppercase;white-space:nowrap}
.tbl td{padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:middle}
.tbl tr:hover td{background:#fbf9f4}
.tbl .code{font-family:ui-monospace,Menlo,Consolas,monospace;font-weight:700;letter-spacing:.04em;white-space:nowrap}
.tbl .acts{display:flex;gap:6px;flex-wrap:wrap}
.linkbtn{font:inherit;font-size:.8rem;font-weight:700;border:1.5px solid var(--line);background:#fff;border-radius:8px;padding:5px 9px;cursor:pointer;color:var(--navy);white-space:nowrap;text-decoration:none}
.linkbtn:hover{border-color:var(--gold)}
.linkbtn.danger{color:#a12a20}
.newcode{margin-top:16px;background:var(--gold-soft);border-radius:14px;padding:16px;display:none}
.newcode .big{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:1.5rem;font-weight:800;color:var(--navy);letter-spacing:.06em;margin:6px 0 10px}
.toolbar{display:flex;gap:10px;justify-content:space-between;align-items:center;margin-bottom:12px;flex-wrap:wrap}
.toolbar input{font:inherit;padding:10px 14px;border:1.5px solid var(--line);border-radius:12px;min-width:220px}
.empty{padding:26px;text-align:center;color:var(--muted)}
.nbt-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:18px}
.nbt-stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 16px}
.nbt-stat b{display:block;font-size:1.6rem;color:var(--navy)}.nbt-stat span{font-size:.8rem;color:var(--muted);font-weight:600}
.katex{font-size:1.05em}
.nbt-field label.tick{display:flex;align-items:center;gap:10px;font-weight:600;font-size:.95rem;color:var(--ink);margin:8px 0;cursor:pointer}
.nbt-field label.tick input{width:20px;height:20px;accent-color:var(--navy);flex:none}
#markBadge:not(:empty){display:inline-block;background:var(--gold);color:#fff;border-radius:999px;font-size:.72rem;padding:1px 8px;margin-left:4px}
.mk-part{border:1px solid var(--line);border-radius:14px;padding:16px;margin-bottom:12px;background:#fff}
.mk-part .hd{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}
.mk-part .ans{background:#faf8f3;border-radius:10px;padding:8px 12px;margin:8px 0}
.mk-part .memo{background:var(--gold-soft);border-radius:10px;padding:8px 12px;font-size:.92rem;margin-top:8px}
.mk-part input.m{width:80px;font:inherit;font-weight:700;padding:8px 10px;border:1.5px solid var(--line);border-radius:10px;text-align:center}
.mk-photos{display:flex;gap:10px;flex-wrap:wrap;margin:8px 0}
.mk-photos a{display:block;width:150px;height:190px;border-radius:10px;overflow:hidden;border:1px solid var(--line);background:#eee}
.mk-photos img{width:100%;height:100%;object-fit:cover}
.mk-part.need{border-left:6px solid var(--gold)}
table.wbt{border-collapse:collapse;margin:8px 0;font-size:.88rem}
table.wbt th,table.wbt td{border:1px solid var(--line);padding:4px 8px;text-align:center}
table.wbt th{background:var(--gold-soft)}