:root{
  --bg:#f7f9ff; --panel:#ffffff; --panel2:#eef2fb; --line:#e4eaf6;
  --ink:#2a3350; --muted:#5f6b8a; --faint:#9aa4be;
  --volt:#4c7dff; --volt2:#9b6cff; --amber:#e88c1c; --green:#13a86a; --pink:#ec4d80;
  --bio:#13a86a; --chem:#f0902f; --phys:#4c7dff; --off:#9aa4be;
  --radius:14px; --shadow:0 10px 26px rgba(80,100,170,.12);
  --maxw:1280px;
}
html[data-theme="dark"]{
  --bg:#0f1729; --panel:#161f33; --panel2:#1e2942; --line:#2c3a5a;
  --ink:#e8edf9; --muted:#9fadcb; --faint:#6f7da3;
  --volt:#5b8cff; --volt2:#a78bff; --amber:#ffb547; --green:#3ddc97; --pink:#ff6f9c;
  --bio:#3ddc97; --chem:#ff8a4d; --phys:#5b8cff; --off:#8b97b8;
  --shadow:0 10px 28px rgba(0,0,0,.5);
}
html[data-theme="dark"] body{background:radial-gradient(1100px 560px at 88% -8%, #1b2a4d 0%, #121a30 45%, #1b1430 100%) fixed}
html[data-theme="dark"] header{background:rgba(17,25,43,.82)}
html[data-theme="dark"] .gn-inner{background:rgba(30,41,66,.78)}
html[data-theme="dark"] .chips .gchip.Biology{color:#5fe0a5}
html[data-theme="dark"] .chips .gchip.Chemistry{color:#ff9189}
html[data-theme="dark"] .chips .gchip.Physics{color:#8fb0ff}
html[data-theme="dark"] .lead.s-Chemistry,html[data-theme="dark"] .ms-opt.s-Chemistry{border-left-color:#ff7a6e}
/* theme toggle */
.brand-right{margin-left:auto;display:flex;align-items:center;gap:14px}
.theme-btn{flex:0 0 auto;background:var(--panel2);border:1px solid var(--line);border-radius:10px;width:38px;height:38px;font-size:17px;line-height:1;cursor:pointer;color:var(--ink)}
.theme-btn:hover{border-color:var(--volt)}
*{box-sizing:border-box}
html,body{margin:0;padding:0;width:100%}
body{
  background:radial-gradient(1100px 560px at 88% -8%, #e6f1ff 0%, #f1ecff 42%, #fdf1f4 100%) fixed;
  color:var(--ink); font:16.5px/1.6 "Segoe UI",system-ui,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--volt);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px}
sub{font-size:.72em;line-height:0} sup{font-size:.72em;line-height:0}

/* header */
header{border-bottom:1px solid var(--line);background:rgba(255,255,255,.82);backdrop-filter:blur(10px);position:sticky;top:0;z-index:20}
.brand{display:flex;align-items:center;gap:14px;padding:16px 0 14px}
.logo{width:38px;height:38px;flex:0 0 auto;filter:drop-shadow(0 0 8px rgba(42,212,255,.5))}
.brand h1{font-size:20px;margin:0;letter-spacing:.3px;font-weight:700}
.brand .sub{color:var(--muted);font-size:12.5px;margin-top:1px}
.tag{font-size:11.5px;color:var(--faint);text-align:right;line-height:1.4}
nav{display:flex;gap:6px;padding-bottom:0}
nav button{
  background:none;border:none;color:var(--muted);font:600 15px/1 "Segoe UI",sans-serif;
  padding:13px 17px;cursor:pointer;border-bottom:2px solid transparent;transition:.15s;
}
nav button:hover{color:var(--ink)}
nav button.active{color:var(--volt);border-bottom-color:var(--volt)}

main.wrap{padding-top:26px;padding-bottom:96px}
.view{display:none;animation:fade .25s ease}
.view.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

h2.sec{font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--faint);margin:0 0 14px;font-weight:700}

/* cards / stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:26px}
.stat{background:linear-gradient(160deg,var(--panel2),var(--panel));border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}
.stat .n{font-size:30px;font-weight:800;line-height:1;background:linear-gradient(90deg,var(--volt),var(--volt2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat .l{color:var(--muted);font-size:12.5px;margin-top:7px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow)}
.panel h3{margin:0 0 14px;font-size:15px}
.panel .hint{color:var(--faint);font-size:12px;font-weight:400;margin-left:6px}

/* bars */
.bar{display:flex;align-items:center;gap:10px;margin:8px 0;font-size:14.5px}
.bar .lab{width:188px;flex:0 0 auto;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bar .track{flex:1;height:16px;background:var(--panel2);border-radius:8px;overflow:hidden;position:relative}
.bar .fill{height:100%;border-radius:8px;background:linear-gradient(90deg,var(--volt2),var(--volt))}
.bar .val{width:74px;flex:0 0 auto;text-align:right;color:var(--muted);font-variant-numeric:tabular-nums;font-size:12px}
.bar.tier1 .lab{font-weight:700}

.subj-dot{display:inline-block;width:9px;height:9px;border-radius:50%;margin-right:7px;vertical-align:middle}
.Biology{color:var(--bio)}.Chemistry{color:var(--chem)}.Physics{color:var(--phys)}.Off-syllabus{color:var(--off)}
.d-Biology{background:var(--bio)}.d-Chemistry{background:var(--chem)}.d-Physics{background:var(--phys)}.d-Off-syllabus{background:var(--off)}

/* ROI table */
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:10px 11px;border-bottom:1px solid var(--line)}
th{color:var(--faint);font-size:11px;letter-spacing:.06em;text-transform:uppercase;font-weight:700;position:sticky;top:0;background:var(--panel)}
tbody tr:hover{background:var(--panel2)}
.pill{display:inline-block;padding:2px 9px;border-radius:20px;font-size:11px;font-weight:700;border:1px solid transparent}
.pill.High{background:rgba(255,93,143,.14);color:var(--pink);border-color:rgba(255,93,143,.3)}
.pill.Medium{background:rgba(255,181,71,.13);color:var(--amber);border-color:rgba(255,181,71,.3)}
.pill.Low{background:rgba(61,220,151,.12);color:var(--green);border-color:rgba(61,220,151,.3)}
.tierbadge{font-size:10px;font-weight:800;padding:2px 7px;border-radius:6px;background:var(--volt);color:#fff}
.golink{color:var(--ink)}.golink:hover{color:var(--volt)}

/* filters */
.toolbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:16px}
.toolbar .field{display:flex;flex-direction:column;gap:4px}
.toolbar label{font-size:10.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--faint);font-weight:700;padding-left:2px}
select,input[type=text],input[type=number]{
  background:var(--panel2);border:1px solid var(--line);color:var(--ink);border-radius:9px;
  padding:8px 11px;font:14px "Segoe UI",sans-serif;min-width:120px;outline:none
}
input[type=text]{min-width:210px}
select:focus,input:focus{border-color:var(--volt)}
.btn{background:linear-gradient(90deg,var(--volt2),var(--volt));color:#fff;border:none;font-weight:700;
  padding:10px 17px;border-radius:9px;cursor:pointer;font-size:14.5px;box-shadow:0 4px 12px rgba(108,108,255,.25)}
.btn:hover{filter:brightness(1.08)}
.btn.ghost{background:none;border:1px solid var(--line);color:var(--muted)}
.btn.ghost:hover{color:var(--ink);border-color:var(--volt)}
.count{margin-left:auto;color:var(--muted);font-size:13px}
.count b{color:var(--volt)}

/* results */
.qrow td .meta{color:var(--faint);font-size:11.5px}
.chip{display:inline-block;font-size:11px;padding:1px 7px;border-radius:6px;background:var(--panel2);border:1px solid var(--line);color:var(--muted);margin-right:5px}
.qref{font-variant-numeric:tabular-nums;font-weight:700;white-space:nowrap}
.links a{font-size:12px;margin-right:9px}
.empty{padding:40px;text-align:center;color:var(--faint)}

/* topic guides */
.chips{display:flex;flex-wrap:wrap;gap:6px;max-width:680px}
.chips .gchip{cursor:pointer;font-size:12px;font-weight:600;padding:4px 10px;border-radius:20px;border:1px solid var(--line);background:var(--panel2);color:var(--muted)}
.chips .gchip.Biology{border-color:rgba(19,168,106,.4);background:rgba(19,168,106,.10);color:#0f8a55}
.chips .gchip.Chemistry{border-color:rgba(224,82,79,.4);background:rgba(224,82,79,.11);color:#c43d3a}
.chips .gchip.Physics{border-color:rgba(76,125,255,.4);background:rgba(76,125,255,.10);color:#3a63d0}
.chips .gchip:hover{filter:saturate(1.5) brightness(1.02)}
.chips .gchip.Biology:hover{border-color:var(--bio)}
.chips .gchip.Chemistry:hover{border-color:#e0524f}
.chips .gchip.Physics:hover{border-color:var(--phys)}
/* subject tint for native <select> options (renders in Chrome/Edge on Windows) */
option.o-Biology{background-color:#e9f7f0}
option.o-Chemistry{background-color:#fdeceb}
option.o-Physics{background-color:#e9f0ff}
.guide{max-width:900px}
.guide-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:6px}
.guide-head .tno{font-size:13px;font-weight:800;color:var(--volt);background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:3px 9px}
.guide-head h2{margin:0;font-size:27px;letter-spacing:.2px}
.guide-head .subpill{font-size:11px;font-weight:700;padding:3px 10px;border-radius:20px;border:1px solid transparent}
.guide-head .subpill.Biology{background:rgba(61,220,151,.12);color:var(--bio);border-color:rgba(61,220,151,.3)}
.guide-head .subpill.Chemistry{background:rgba(255,181,71,.12);color:var(--chem);border-color:rgba(255,181,71,.3)}
.guide-head .subpill.Physics{background:rgba(42,212,255,.12);color:var(--phys);border-color:rgba(42,212,255,.3)}
.guide-head .vbadge{font-size:11px;color:var(--green);border:1px solid rgba(61,220,151,.3);border-radius:20px;padding:3px 10px}
.guide-head .mkbadge{font-size:11px;color:var(--muted);margin-left:auto}
.guide .lead{color:var(--ink);font-size:16px;margin:10px 0 4px;line-height:1.6;background:var(--panel2);border:1px solid var(--line);border-left:4px solid var(--volt);border-radius:12px;padding:15px 18px;box-shadow:var(--shadow)}
.guide .lead.s-Biology{border-left-color:#13a86a}
.guide .lead.s-Chemistry{border-left-color:#e0524f}
.guide .lead.s-Physics{border-left-color:#4c7dff}
.gsec{margin:0 0 18px;padding:20px 24px;background:var(--panel);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);scroll-margin-top:calc(var(--header-h,118px) + 60px)}
.gsec h3{font-size:13.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);margin:0 0 15px;font-weight:800;display:flex;align-items:center;gap:8px}
.gsec h3 .ic{font-size:14px}
.klist{margin:0;padding:0;list-style:none;display:grid;gap:8px}
.klist li{position:relative;padding-left:22px;font-size:16px;line-height:1.55}
.klist li:before{content:"";position:absolute;left:4px;top:8px;width:7px;height:7px;border-radius:2px;background:linear-gradient(135deg,var(--volt2),var(--volt))}
.terms{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.term{background:var(--panel2);border:1px solid var(--line);border-radius:10px;padding:12px 15px}
.term b{color:var(--ink);display:block;margin-bottom:3px;font-size:15px}
.term span{color:var(--muted);font-size:14.5px;line-height:1.5}
.eqs{display:flex;flex-wrap:wrap;gap:10px}
.eq{background:var(--panel);border:1px solid var(--line);border-left:3px solid var(--volt);border-radius:10px;padding:10px 14px;min-width:200px}
.eq .nm{font-size:11px;color:var(--faint);text-transform:uppercase;letter-spacing:.05em}
.eq .fm{font-size:18.5px;font-weight:700;font-family:"Cambria Math",Georgia,serif;margin:4px 0;color:var(--volt)}
.eq .nt{font-size:13.5px;color:var(--muted)}
.worked{background:var(--panel2);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.worked .q{font-weight:600;margin-bottom:10px;font-size:15.5px}
.worked .s{color:var(--muted);font-size:15px;white-space:pre-wrap;line-height:1.7;border-top:1px dashed var(--line);padding-top:10px}
.mc-grid{display:grid;gap:12px}
.mc{display:grid;grid-template-columns:1fr 1fr;gap:0;border-radius:12px;overflow:hidden;border:1px solid var(--line)}
.mc .wrong,.mc .right{padding:13px 16px;font-size:15px;line-height:1.52}
.mc .wrong{background:rgba(255,93,143,.08);border-right:1px solid var(--line)}
.mc .right{background:rgba(61,220,151,.07)}
.mc .tag{display:block;font-size:10.5px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;margin-bottom:5px}
.mc .wrong .tag{color:var(--pink)}
.mc .right .tag{color:var(--green)}
.cmd{width:100%}
.cmd td{vertical-align:top;font-size:15px}
.cmd td.w{width:150px;font-weight:700;color:var(--volt)}
.syl-sub{font-weight:700;font-size:14px;color:var(--ink);margin:16px 0 6px}
.syl-sub:first-child{margin-top:0}
.syl-list{margin:0 0 4px;padding-left:24px}
.syl-list li{font-size:14px;color:var(--muted);margin:5px 0;line-height:1.5}
.guide-missing{padding:50px;text-align:center;color:var(--faint);border:1px dashed var(--line);border-radius:12px}
/* in-guide section quick-nav */
.guidenav{position:sticky;top:var(--header-h,118px);z-index:10;display:flex;justify-content:center;padding:8px 0 10px}
.gn-inner{display:inline-flex;flex-wrap:wrap;gap:3px;justify-content:center;
  background:rgba(255,255,255,.72);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border:1px solid var(--line);border-radius:30px;padding:5px;box-shadow:0 6px 18px rgba(80,100,170,.16)}
.gn-inner a{font-size:12.5px;font-weight:600;color:var(--muted);border-radius:20px;padding:6px 13px;transition:.12s}
.gn-inner a:hover{color:var(--volt);background:var(--panel2);text-decoration:none}

/* horizontal-scroll cue: fade the edge(s) that have more content (classes toggled by JS) */
.hcue.cue-right{-webkit-mask-image:linear-gradient(90deg,#000 calc(100% - 28px),transparent);mask-image:linear-gradient(90deg,#000 calc(100% - 28px),transparent)}
.hcue.cue-left{-webkit-mask-image:linear-gradient(90deg,transparent,#000 28px);mask-image:linear-gradient(90deg,transparent,#000 28px)}
.hcue.cue-left.cue-right{-webkit-mask-image:linear-gradient(90deg,transparent,#000 28px,#000 calc(100% - 28px),transparent);mask-image:linear-gradient(90deg,transparent,#000 28px,#000 calc(100% - 28px),transparent)}
.guide-foot{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:26px;padding-top:18px;border-top:1px solid var(--line)}
.guide-foot .spacer{flex:1}
/* formulae & units page */
.fsubject{margin:26px 0}
.fsubject>h3{font-size:15px;margin:0 0 12px;display:flex;align-items:center;gap:9px}
.ftopic{margin:0 0 16px}
.ftopic .ft-h{font-size:12.5px;font-weight:700;color:var(--muted);margin:0 0 9px;cursor:pointer}
.ftopic .ft-h:hover{color:var(--volt)}
/* explore year group separator */
.qgroup td{background:linear-gradient(90deg,var(--panel2),transparent);font-weight:800;color:var(--ink);font-size:13px;letter-spacing:.04em;padding:8px 11px;border-bottom:2px solid var(--line)}
.qgroup td .gc{color:var(--faint);font-weight:600;margin-left:8px;font-size:12px}
@media(max-width:760px){.terms{grid-template-columns:1fr}.mc{grid-template-columns:1fr}.mc .wrong{border-right:none;border-bottom:1px solid var(--line)}}

/* question image lightbox */
.qmodal-ov{position:fixed;inset:0;background:rgba(20,28,50,.55);backdrop-filter:blur(3px);z-index:100;display:flex;align-items:flex-start;justify-content:center;overflow:auto;padding:26px}
.qmodal{background:var(--panel);border-radius:16px;max-width:900px;width:100%;box-shadow:0 24px 70px rgba(0,0,0,.4);margin:auto;overflow:hidden}
.qmodal-h{display:flex;align-items:center;gap:11px;padding:14px 18px;border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--panel);flex-wrap:wrap}
.qmodal-h .t{font-weight:700;font-size:15.5px;color:var(--ink)}
.qmodal-h .x{margin-left:auto;cursor:pointer;border:none;background:var(--panel2);border-radius:9px;width:34px;height:34px;font-size:20px;line-height:1;color:var(--muted)}
.qmodal-h .x:hover{color:var(--ink)}
.qmodal-body{padding:16px 18px;background:var(--panel2)}
.qmodal-body img{width:100%;height:auto;display:block;border:1px solid var(--line);border-radius:8px;margin-bottom:10px;background:#fff;padding-bottom:14px}
.qmodal-foot{padding:12px 18px;border-top:1px solid var(--line);display:flex;gap:16px;align-items:center;font-size:13.5px;color:var(--muted)}
.viewq{cursor:pointer;color:var(--volt);font-weight:600}
.viewq:hover{text-decoration:underline}
.imgicon{font-size:11.5px;font-weight:700;color:var(--volt);background:rgba(76,125,255,.1);border:1px solid rgba(76,125,255,.3);border-radius:6px;padding:1px 7px;margin-left:7px;cursor:pointer;white-space:nowrap}
.imgicon:hover{background:rgba(76,125,255,.2)}

/* History nav button */
nav button.navaction{margin-left:auto;color:var(--volt);font-weight:700}
nav button.navaction:hover{color:var(--volt)}

/* multi-select dropdown (topics / years) */
.ms-dd{position:relative;min-width:150px}
.ms-btn{width:100%;text-align:left;background:var(--panel2);border:1px solid var(--line);color:var(--ink);border-radius:9px;padding:8px 11px;font:14px "Segoe UI",sans-serif;cursor:pointer;display:flex;justify-content:space-between;gap:8px;align-items:center}
.ms-btn:hover{border-color:var(--volt)}
.ms-btn .ms-car{color:var(--faint);font-size:11px;flex:0 0 auto}
.ms-btn .ms-lab{flex:1;text-align:left;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cs-dd{min-width:165px}
.ms-opt.sel{background:var(--panel2);font-weight:700}
.ms-panel{display:none;position:absolute;z-index:30;top:calc(100% + 4px);left:0;min-width:250px;max-height:320px;overflow:auto;background:var(--panel);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);padding:6px}
.ms-dd.open .ms-panel{display:block}
.ms-opt{display:flex;align-items:center;gap:9px;padding:7px 9px;border-radius:7px;font-size:13.5px;cursor:pointer;color:var(--ink);white-space:nowrap}
.ms-opt:hover{background:var(--panel2)}
.ms-opt input{width:15px;height:15px;accent-color:var(--volt);cursor:pointer;flex:0 0 auto}
/* subject tint for topic options */
.ms-opt.s-Biology{border-left:3px solid #13a86a;background:rgba(19,168,106,.06)}
.ms-opt.s-Chemistry{border-left:3px solid #e0524f;background:rgba(224,82,79,.07)}
.ms-opt.s-Physics{border-left:3px solid #4c7dff;background:rgba(76,125,255,.06)}
.ms-opt.s-Biology:hover{background:rgba(19,168,106,.14)}
.ms-opt.s-Chemistry:hover{background:rgba(224,82,79,.15)}
.ms-opt.s-Physics:hover{background:rgba(76,125,255,.14)}

/* history modal */
.hist-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.hist-head h2{margin:0;font-size:18px}
.hist-empty{padding:36px;text-align:center;color:var(--faint)}
.hist-item{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--line);border-radius:10px;margin-bottom:8px;background:var(--panel)}
.hist-item .hi-main{flex:1;min-width:0;cursor:pointer}
.hist-item:hover{border-color:var(--volt)}
.hist-item .hi-title{font-weight:600;font-size:14.5px;color:var(--ink)}
.hist-item .hi-sub{font-size:12.5px;color:var(--muted);margin-top:2px}
.hist-item .hi-time{font-size:11.5px;color:var(--faint);white-space:nowrap}
.hist-item .hi-del{border:none;background:var(--panel2);color:var(--muted);border-radius:8px;width:30px;height:30px;cursor:pointer;font-size:16px;flex:0 0 auto;line-height:1}
.hist-item .hi-del:hover{color:var(--pink);background:rgba(236,77,128,.12)}

.disclaimer{color:#c47d12;font-size:11.5px}
.changelog-link{cursor:pointer;color:var(--volt);font-weight:600}
.changelog-link:hover{text-decoration:underline}
.cl-entry{margin-bottom:16px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.cl-entry:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}
.cl-ver{font-weight:800;font-size:15px;color:var(--ink)}
.cl-ver .cl-date{font-weight:500;font-size:12.5px;color:var(--faint);margin-left:8px}
.cl-list{margin:8px 0 0;padding-left:20px}
.cl-list li{font-size:13.5px;color:var(--muted);margin:4px 0;line-height:1.5}
.print-disclaimer{font-size:9pt;color:#777;margin-top:4px}

/* worksheet */
.ws-out{margin-top:20px}
.ws-head{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.ws-head h3{margin:0}
.ws-q{border:1px solid var(--line);border-radius:11px;padding:12px 15px;margin:9px 0;background:var(--panel)}
.ws-q .top{display:flex;gap:10px;align-items:baseline}
.ws-q .num{font-weight:800;color:var(--volt);font-size:15px}
.ws-q .desc{font-size:14.5px}
.ws-q .sub{color:var(--faint);font-size:12px;margin-top:5px}
/* print sheet: actual question images, hidden on screen */
#ws-print{display:none}
.print-head{margin:0 0 14px}
.print-head h2{margin:0;font-size:17pt;color:#000}
.print-head .print-sub{font-size:10.5pt;color:#333;margin-top:2px}
.print-q{break-inside:avoid;page-break-inside:avoid;margin:0 0 14px}
.print-q .print-cap{font:600 11pt/1.35 "Segoe UI",sans-serif;color:#000;margin:0 0 5px}
.print-q img{max-width:100%;max-height:250mm;height:auto;display:block;border:1px solid #bbb;border-radius:4px;background:#fff;padding-bottom:10px}
.print-q .print-text{font-size:11pt;color:#000}
.print-answers{break-before:page;page-break-before:always;margin-top:18px}
.print-answers h2{font-size:15pt;margin:0 0 12px;color:#000}
.ans-row{color:#000;padding:6px 0;border-bottom:1px solid #eee;break-inside:avoid;page-break-inside:avoid}
.ans-q{font-weight:800;margin-right:6px}
.ans-key{font-weight:800;font-size:12pt}
.ans-see{color:#444;font-size:10.5pt}
.ans-ref{color:#888;font-size:9.5pt;margin-left:6px}
.ans-ms{margin:3px 0 0 16px}
.ans-part{font-size:10.5pt;line-height:1.45;margin:2px 0}
.ans-part b{color:#000;font-weight:700;margin-right:4px}
.ans-mk{color:#888;font-size:9.5pt}
/* mark-scheme toggle */
.chk{display:flex;align-items:center;gap:7px;font-size:13.5px;color:var(--muted);cursor:pointer;user-select:none;white-space:nowrap}
.chk input{width:16px;height:16px;cursor:pointer;accent-color:var(--volt)}

@media print{
  @page{size:A4;margin:12mm}
  /* always print light, even if the app is in dark mode */
  html[data-theme="dark"]{--bg:#fff;--panel:#fff;--panel2:#f4f6fb;--ink:#000;--muted:#333;--faint:#666;--line:#ccc}
  body{background:#fff;color:#000}
  header,nav,.toolbar,.no-print,footer{display:none!important}
  /* print ONLY the tab that is currently open */
  .view{display:none!important}
  .view.active{display:block!important}
  a{color:#000;text-decoration:none}
  .gsec{break-inside:avoid}
  /* on the build tab: print the question IMAGES (#ws-print), not the on-screen text cards (#wsout) */
  #wsout{display:none!important}
  #ws-print{display:block!important}
}
footer{border-top:1px solid var(--line);color:var(--faint);font-size:12px;text-align:center;line-height:1.7}
footer.wrap{padding:24px 32px 22px}

@media(max-width:820px){
  .wrap{padding:0 16px}
  /* slim the header on mobile (the stats tag wraps and bloats height) */
  .brand{padding:12px 0 8px;gap:11px}
  .brand .tag{display:none}
  .brand h1{font-size:19px}
  .brand .sub{font-size:11.5px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .grid2{grid-template-columns:1fr}
  .bar .lab{width:130px}
  /* top nav: one horizontally-scrollable row (don't wrap/cram) */
  nav{flex-wrap:nowrap;overflow-x:auto;overflow-y:hidden;scrollbar-width:none;-webkit-overflow-scrolling:touch}
  nav::-webkit-scrollbar{display:none}
  nav button{flex:0 0 auto;white-space:nowrap;padding:12px 13px}
  /* topic-guide section pill: scroll across as one pill (not wrap to extra rows) */
  .guidenav{justify-content:flex-start}
  .gn-inner{flex-wrap:nowrap;overflow-x:auto;max-width:100%;scrollbar-width:none;-webkit-overflow-scrolling:touch}
  .gn-inner::-webkit-scrollbar{display:none}
  .gn-inner a{flex:0 0 auto;white-space:nowrap}
  /* explore results: stack each row into a card that wraps to width (no sideways scroll) */
  #qtable{min-width:0;display:block}
  #qtable thead{display:none}
  #qtable tbody{display:block}
  #qtable tr{display:block}
  #qtable tr.qrow{border:1px solid var(--line);border-radius:10px;padding:9px 11px;margin:0 0 8px}
  #qtable tr.qrow td{display:inline-block;border:none;padding:0 7px 0 0;font-size:12.5px;color:var(--muted);vertical-align:middle}
  #qtable tr.qrow td .meta{display:inline;margin-left:4px}
  #qtable tr.qrow td:nth-child(7){display:block;color:var(--ink);font-size:13.5px;line-height:1.45;margin-top:5px;padding:0}
  #qtable tr.qgroup td{display:block;margin:2px 0 6px}
  /* dashboard ROI ranking: wrap each row instead of scrolling sideways */
  #roitable{display:block}
  #roitable thead{display:none}
  #roitable tbody{display:block}
  #roitable tbody tr{display:block;border-bottom:1px solid var(--line);padding:8px 2px}
  #roitable tbody td{display:inline-block;border:none;padding:1px 8px 1px 0;font-size:12.5px;vertical-align:middle}
  #roitable tbody td:nth-child(2){font-size:13px;color:var(--ink)}
}