/* Volume C · Ward Officer MCQ Bank — "question-paper ledger, studied at night" */
:root{
  --bg:#0d1220; --bg2:#111831; --card:#171f33; --card2:#1c2542; --line:#273350;
  --ink:#e9edf7; --mut:#93a0c0; --faint:#5c6a8f;
  --acc:#35c77e; --acc-deep:#15794a; --acc-soft:rgba(53,199,126,.13);
  --bad:#ff6b6b; --bad-soft:rgba(255,107,107,.13);
  --amber:#f2b135; --amber-soft:rgba(242,177,53,.12);
  --blue:#6ea8ff; --chip:#202b49;
  --r:16px; --rs:10px;
  --shadow:0 10px 30px rgba(3,6,18,.45);
  --serif:"Instrument Serif",Georgia,serif;
  --sans:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"Spline Sans Mono",ui-monospace,Menlo,monospace;
}
[data-theme="light"]{
  --bg:#f4f2ec; --bg2:#ece9e0; --card:#ffffff; --card2:#faf8f2; --line:#ddd8ca;
  --ink:#1c2233; --mut:#5a6480; --faint:#9aa2b8;
  --acc:#158f57; --acc-deep:#0e6b40; --acc-soft:rgba(21,143,87,.10);
  --bad:#d43d3d; --bad-soft:rgba(212,61,61,.09);
  --amber:#b07908; --amber-soft:rgba(197,141,20,.12);
  --blue:#2f6fd8; --chip:#efece2;
  --shadow:0 8px 24px rgba(30,32,40,.10);
}
*{box-sizing:border-box; -webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth}
body{margin:0; background:var(--bg); color:var(--ink); font:16px/1.55 var(--sans);
  padding-bottom:calc(76px + env(safe-area-inset-bottom));}
button{font:inherit; color:inherit; background:none; border:0; cursor:pointer}
a{color:inherit; text-decoration:none}
svg{fill:currentColor}
#app{max-width:760px; margin:0 auto; padding:18px 16px 24px; min-height:70vh}
@media(min-width:760px){#app{padding-top:28px}}

/* ---------- primitives ---------- */
.h-serif{font-family:var(--serif); font-weight:400; letter-spacing:.2px}
.mono{font-family:var(--mono)}
.card{background:var(--card); border:1px solid var(--line); border-radius:var(--r);
  padding:16px; box-shadow:var(--shadow)}
.btn{display:inline-flex; align-items:center; justify-content:center; gap:8px;
  background:var(--acc); color:#06170e; font-weight:600; border-radius:12px;
  padding:13px 20px; transition:transform .08s ease, filter .15s;}
[data-theme="light"] .btn{color:#fff}
.btn:active{transform:scale(.97)}
.btn.ghost{background:var(--chip); color:var(--ink); font-weight:500}
.btn.warn{background:var(--bad); color:#fff}
.btn.small{padding:9px 14px; border-radius:10px; font-size:.9rem}
.btn[disabled]{opacity:.4; pointer-events:none}
.row{display:flex; align-items:center; gap:10px}
.spread{display:flex; align-items:center; justify-content:space-between; gap:10px}
.wrap{display:flex; flex-wrap:wrap; gap:8px}
.dim{color:var(--mut)} .tiny{font-size:.8rem} .sm{font-size:.9rem}
hr.rule{border:0; border-top:1px solid var(--line); margin:16px 0}

/* metadata chip row — the book's header line */
.meta{display:flex; flex-wrap:wrap; align-items:center; gap:4px 0; font-family:var(--mono);
  font-size:.74rem; letter-spacing:.02em; color:var(--mut)}
.meta .m{padding:2px 7px; border-radius:6px; background:var(--chip); white-space:nowrap}
.meta .dot{margin:0 5px; color:var(--faint)}
.meta .t-Y{background:var(--acc-soft); color:var(--acc); font-weight:600}
.meta .t-P{background:rgba(110,168,255,.14); color:var(--blue)}
.meta .t-T{background:rgba(190,140,255,.14); color:#b98dff}
[data-theme="light"] .meta .t-T{color:#7a3fd6; background:rgba(122,63,214,.1)}
.meta .t-D{background:var(--amber-soft); color:var(--amber)}
.meta .m.diff-H{color:var(--bad)} .meta .m.diff-E{color:var(--acc)}

/* chips (filters) */
.chips{display:flex; flex-wrap:wrap; gap:8px}
.chip{padding:8px 13px; border-radius:999px; background:var(--chip); border:1px solid var(--line);
  font-size:.88rem; color:var(--mut); transition:.15s}
.chip.on{background:var(--acc-soft); border-color:var(--acc); color:var(--acc); font-weight:600}
.chip:active{transform:scale(.96)}

/* ---------- header / hero ---------- */
.apphead{display:flex; justify-content:space-between; align-items:flex-start; margin-bottom:14px}
.apphead .eyebrow{font-family:var(--mono); font-size:.72rem; letter-spacing:.14em;
  text-transform:uppercase; color:var(--acc)}
.apphead h1{font-family:var(--serif); font-size:2rem; line-height:1.1; margin:.15em 0 0; font-weight:400}
.iconbtn{width:40px; height:40px; border-radius:12px; background:var(--chip); border:1px solid var(--line);
  display:grid; place-items:center; color:var(--mut)}
.iconbtn svg{width:19px; height:19px}

.hero{position:relative; overflow:hidden; background:linear-gradient(150deg,var(--card2),var(--card));
  border:1px solid var(--line); border-radius:var(--r); padding:18px; box-shadow:var(--shadow); margin-bottom:18px}
.hero .paperline{font-family:var(--mono); font-size:.72rem; color:var(--faint); margin-top:10px}
.ringwrap{display:flex; gap:16px; align-items:center}
.ring{--p:0; width:84px; height:84px; border-radius:50%; flex:none;
  background:conic-gradient(var(--acc) calc(var(--p)*1%), var(--chip) 0);
  display:grid; place-items:center}
.ring::after{content:""; position:absolute}
.ring b{width:64px; height:64px; border-radius:50%; background:var(--card); display:grid;
  place-items:center; font-family:var(--mono); font-size:.95rem}
.hero .stat{font-size:.86rem; color:var(--mut)}
.hero .stat b{color:var(--ink); font-family:var(--mono)}
.streak{color:var(--amber); font-weight:600}

/* mode grid */
.modes{display:grid; grid-template-columns:1fr 1fr; gap:12px; margin-bottom:18px}
.mode{position:relative; text-align:left; background:var(--card); border:1px solid var(--line);
  border-radius:var(--r); padding:14px; min-height:104px; display:flex; flex-direction:column;
  justify-content:space-between; box-shadow:var(--shadow); transition:.15s}
.mode:active{transform:scale(.98)}
.mode .k{font-family:var(--mono); font-size:.68rem; letter-spacing:.1em; color:var(--faint); text-transform:uppercase}
.mode h3{margin:6px 0 2px; font-size:1.02rem; font-weight:600}
.mode .n{font-family:var(--mono); font-size:.8rem; color:var(--acc)}
.mode.big{grid-column:1/-1; min-height:0; flex-direction:row; align-items:center; gap:12px}
.mode .glyph{width:38px; height:38px; border-radius:11px; background:var(--acc-soft);
  color:var(--acc); display:grid; place-items:center; flex:none}
.mode .glyph svg{width:20px; height:20px}
.mode .glyph.amber{background:var(--amber-soft); color:var(--amber)}
.mode .glyph.blue{background:rgba(110,168,255,.14); color:var(--blue)}

.sechead{margin:22px 0 10px}
.sechead h2{font-family:var(--serif); font-size:1.35rem; margin:0; font-weight:400}
.sechead .sub{font-size:.85rem; color:var(--mut)}

/* unit cards */
.unitcard{display:flex; align-items:center; gap:12px; width:100%; text-align:left;
  background:var(--card); border:1px solid var(--line); border-radius:var(--r);
  padding:13px 14px; margin-bottom:10px; box-shadow:var(--shadow)}
.unitcard:active{transform:scale(.985)}
.unum{font-family:var(--serif); font-size:1.5rem; width:40px; height:44px; flex:none;
  display:grid; place-items:center; border-right:1px solid var(--line); color:var(--acc)}
.unitcard .uinfo{flex:1; min-width:0}
.unitcard .uinfo h3{margin:0; font-size:.98rem; font-weight:600; white-space:nowrap;
  overflow:hidden; text-overflow:ellipsis}
.ubar{height:5px; border-radius:4px; background:var(--chip); margin-top:7px; overflow:hidden}
.ubar i{display:block; height:100%; background:var(--acc); border-radius:4px}
.unitcard .un{font-family:var(--mono); font-size:.76rem; color:var(--mut); flex:none}

/* topic list */
.topic{display:flex; justify-content:space-between; gap:10px; width:100%; text-align:left;
  padding:13px 6px; border-bottom:1px solid var(--line)}
.topic:last-child{border-bottom:0}
.topic .tn{font-size:.94rem}
.topic .tc{font-family:var(--mono); font-size:.78rem; color:var(--mut); flex:none}
.topic .tc .ok{color:var(--acc)}

/* ---------- session ---------- */
.sess-top{position:sticky; top:0; z-index:20; background:linear-gradient(var(--bg) 82%,transparent);
  padding:10px 0 12px; margin:-6px 0 8px}
.sess-bar{display:flex; align-items:center; gap:10px}
.sess-bar .prog{flex:1; height:5px; background:var(--chip); border-radius:4px; overflow:hidden}
.sess-bar .prog i{display:block; height:100%; background:var(--acc); transition:width .25s}
.sess-bar .ct{font-family:var(--mono); font-size:.8rem; color:var(--mut)}
.timer{font-family:var(--mono); font-size:.92rem; padding:5px 10px; border-radius:9px;
  background:var(--chip); border:1px solid var(--line)}
.timer.low{color:var(--bad); border-color:var(--bad); animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.55}}

.qcard{background:var(--card); border:1px solid var(--line); border-radius:var(--r);
  padding:16px; box-shadow:var(--shadow); animation:up .22s ease}
@keyframes up{from{opacity:0; transform:translateY(8px)}}
.stem{font-size:1.06rem; line-height:1.6; margin:12px 0 14px}
.stem .varnote{display:block; margin-top:8px; font-size:.78rem; color:var(--faint); font-family:var(--mono)}

.opt{display:flex; gap:12px; align-items:flex-start; width:100%; text-align:left;
  padding:12px; border:1.5px solid var(--line); border-radius:13px; margin-bottom:10px;
  background:var(--card2); transition:border-color .12s, background .12s; font-size:.98rem; line-height:1.5}
.opt .b{font-family:var(--mono); font-weight:600; width:30px; height:30px; flex:none;
  display:grid; place-items:center; border:1.5px solid var(--line); border-radius:9px;
  background:var(--card); font-size:.86rem; transition:.12s}
.opt:not(.locked):active{border-color:var(--acc)}
.opt.sel{border-color:var(--blue); background:rgba(110,168,255,.08)}
.opt.sel .b{border-color:var(--blue); color:var(--blue)}
.opt.correct{border-color:var(--acc); background:var(--acc-soft)}
.opt.correct .b{background:var(--acc); border-color:var(--acc); color:#06170e}
[data-theme="light"] .opt.correct .b{color:#fff}
.opt.wrong{border-color:var(--bad); background:var(--bad-soft)}
.opt.wrong .b{background:var(--bad); border-color:var(--bad); color:#fff}
.opt.locked{pointer-events:none}
.opt.faded{opacity:.55}

/* feedback — the book's green rule */
.feedback{margin-top:14px; animation:up .25s ease}
.fb-ans{border-left:3px solid var(--acc); padding:10px 12px; background:var(--acc-soft);
  border-radius:0 12px 12px 0; font-size:.94rem}
.fb-ans.was-wrong{border-left-color:var(--bad); background:var(--bad-soft)}
.fb-ans .lead{font-weight:700; font-family:var(--mono); font-size:.82rem;
  letter-spacing:.06em; text-transform:uppercase}
.fb-ans .lead.ok{color:var(--acc)} .fb-ans .lead.no{color:var(--bad)}
.fb-block{margin-top:10px; padding:11px 12px; border-radius:12px; background:var(--card2);
  border:1px solid var(--line); font-size:.92rem; line-height:1.6}
.fb-block .lab{font-family:var(--mono); font-size:.7rem; letter-spacing:.12em;
  text-transform:uppercase; color:var(--faint); display:block; margin-bottom:4px}
.fb-trap{background:var(--amber-soft); border-color:rgba(242,177,53,.4)}
.fb-trap .lab{color:var(--amber)}
.fb-so{background:var(--amber-soft); border-color:var(--amber); border-style:dashed}
.fb-so .lab{color:var(--amber)}
.fb-cancel{background:var(--bad-soft); border-color:var(--bad)}
.fb-cancel .lab{color:var(--bad)}

.sess-foot{position:fixed; left:0; right:0; bottom:calc(64px + env(safe-area-inset-bottom));
  z-index:25; pointer-events:none}
.sess-foot .inner{max-width:760px; margin:0 auto; padding:0 16px; display:flex; gap:10px}
.sess-foot .btn{pointer-events:auto; flex:1; box-shadow:var(--shadow)}
.exam .sess-foot{bottom:calc(12px + env(safe-area-inset-bottom))}
body.in-session .bottomnav{display:none}
body.in-session{padding-bottom:120px}

.flagbtn{color:var(--faint)} .flagbtn.on{color:var(--amber)}

/* palette sheet */
.sheet-scrim{position:fixed; inset:0; background:rgba(4,7,16,.6); z-index:40; animation:fade .2s}
@keyframes fade{from{opacity:0}}
.sheet{position:fixed; left:0; right:0; bottom:0; z-index:41; background:var(--card);
  border-radius:20px 20px 0 0; border:1px solid var(--line); max-width:760px; margin:0 auto;
  padding:16px 16px calc(20px + env(safe-area-inset-bottom)); max-height:78vh; overflow:auto;
  animation:rise .22s ease}
@keyframes rise{from{transform:translateY(40px); opacity:0}}
.pal{display:grid; grid-template-columns:repeat(auto-fill,minmax(44px,1fr)); gap:8px; margin-top:12px}
.pal button{aspect-ratio:1; border-radius:10px; background:var(--chip); border:1px solid var(--line);
  font-family:var(--mono); font-size:.8rem; color:var(--mut)}
.pal button.done{background:var(--acc-soft); border-color:var(--acc); color:var(--acc)}
.pal button.flag{border-color:var(--amber); color:var(--amber)}
.pal button.now{outline:2px solid var(--blue)}
.legend{display:flex; gap:14px; font-size:.78rem; color:var(--mut); margin-top:10px}
.legend i{display:inline-block; width:10px; height:10px; border-radius:3px; margin-right:5px}

/* ---------- results ---------- */
.score-hero{text-align:center; padding:26px 16px}
.score-hero .big{font-family:var(--serif); font-size:3.4rem; line-height:1}
.score-hero .of{color:var(--mut); font-size:1rem}
.verdict{display:inline-block; margin-top:10px; padding:6px 14px; border-radius:999px;
  font-size:.85rem; font-weight:600}
.verdict.ok{background:var(--acc-soft); color:var(--acc)}
.verdict.mid{background:var(--amber-soft); color:var(--amber)}
.tri{display:flex; gap:10px; margin:14px 0}
.tri .card{flex:1; text-align:center; padding:12px 8px}
.tri .card b{font-family:var(--mono); font-size:1.2rem; display:block}
.tri .g b{color:var(--acc)} .tri .r b{color:var(--bad)} .tri .y b{color:var(--mut)}
.ubreak{margin-top:6px}
.ubreak .rowline{display:flex; align-items:center; gap:10px; margin:9px 0; font-size:.87rem}
.ubreak .rowline .nm{width:150px; flex:none; white-space:nowrap; overflow:hidden; text-overflow:ellipsis}
.ubreak .bar{flex:1; height:7px; background:var(--chip); border-radius:5px; overflow:hidden}
.ubreak .bar i{display:block; height:100%; background:var(--acc)}
.ubreak .pc{font-family:var(--mono); font-size:.78rem; width:70px; text-align:right; color:var(--mut)}

/* stats */
.statgrid{display:grid; grid-template-columns:1fr 1fr; gap:10px; margin-bottom:14px}
.statgrid .card{padding:13px}
.statgrid b{font-family:var(--mono); font-size:1.35rem; display:block}
.statgrid span{font-size:.8rem; color:var(--mut)}
.histline{display:flex; justify-content:space-between; gap:10px; padding:11px 4px;
  border-bottom:1px solid var(--line); font-size:.9rem}
.histline:last-child{border:0}
.histline .sc{font-family:var(--mono)}

/* builder */
.fieldlab{font-family:var(--mono); font-size:.72rem; letter-spacing:.12em; text-transform:uppercase;
  color:var(--faint); margin:16px 0 8px}
.toggle{display:flex; justify-content:space-between; align-items:center; padding:12px 4px;
  border-bottom:1px solid var(--line); font-size:.94rem}
.toggle:last-child{border:0}
.sw{width:46px; height:27px; border-radius:999px; background:var(--chip); border:1px solid var(--line);
  position:relative; transition:.18s; flex:none}
.sw i{position:absolute; top:2.5px; left:3px; width:20px; height:20px; border-radius:50%;
  background:var(--mut); transition:.18s}
.sw.on{background:var(--acc-deep); border-color:var(--acc)}
.sw.on i{left:21px; background:#fff}
.livecount{position:sticky; bottom:calc(76px + env(safe-area-inset-bottom)); margin-top:16px}
.livecount .btn{width:100%}
select,input[type=number]{background:var(--card2); color:var(--ink); border:1px solid var(--line);
  border-radius:10px; padding:10px 12px; font:inherit}

/* bottom nav */
.bottomnav{position:fixed; left:0; right:0; bottom:0; z-index:30;
  background:color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter:blur(14px);
  border-top:1px solid var(--line); display:flex; justify-content:space-around;
  padding:8px 6px calc(8px + env(safe-area-inset-bottom))}
.bottomnav a{display:flex; flex-direction:column; align-items:center; gap:3px;
  font-size:.68rem; color:var(--faint); padding:4px 12px; border-radius:12px}
.bottomnav a svg{width:21px; height:21px}
.bottomnav a.on{color:var(--acc)}
.empty{text-align:center; color:var(--mut); padding:36px 12px; font-size:.94rem}
.backrow{margin-bottom:12px}
.backrow button{color:var(--mut); font-size:.9rem; display:inline-flex; gap:6px; align-items:center}
:focus-visible{outline:2px solid var(--blue); outline-offset:2px; border-radius:6px}
@media (prefers-reduced-motion:reduce){*{animation:none!important; transition:none!important}}
@media(min-width:560px){.modes{grid-template-columns:1fr 1fr 1fr}.mode.big{grid-column:auto}}

/* ---------- v2 polish ---------- */
.ringx{width:88px;height:88px;flex:none;transform:rotate(-90deg)}
.ringx .ring-t{fill:none;stroke:var(--chip);stroke-width:8}
.ringx .ring-p{fill:none;stroke:url(#rg);stroke-width:8;stroke-linecap:round;transition:stroke-dashoffset .7s ease}
.ringx text{transform:rotate(90deg);transform-origin:42px 42px;fill:var(--ink);font-family:var(--mono);font-size:15px;font-weight:600;text-anchor:middle}
.form{display:flex;align-items:center;gap:8px;margin-top:9px}
.omr{display:inline-flex;gap:5px}
.omr i{width:12px;height:12px;border-radius:50%;border:1.6px solid var(--faint);background:transparent}
.omr i.g{background:var(--acc);border-color:var(--acc)}
.omr i.r{background:var(--bad);border-color:var(--bad)}
details.more{margin-top:10px}
details.more summary{list-style:none;cursor:pointer;font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);padding:8px 2px;display:flex;align-items:center;gap:7px}
details.more summary::-webkit-details-marker{display:none}
details.more summary::before{content:"▸";transition:transform .15s;color:var(--acc)}
details.more[open] summary::before{transform:rotate(90deg)}
details.more summary:active{color:var(--mut)}
.opt.correct{animation:okpulse .4s ease}
.opt.wrong{animation:shake .32s ease}
@keyframes okpulse{0%{transform:scale(1)}40%{transform:scale(1.015)}100%{transform:scale(1)}}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-4px)}60%{transform:translateX(3px)}}
.stem{font-size:1.1rem;line-height:1.66}
.sechead h2{position:relative;padding-bottom:7px}
.sechead h2::after{content:"";position:absolute;left:0;bottom:0;width:30px;height:2.5px;border-radius:2px;background:var(--acc-deep)}
.bottomnav a.on{background:var(--acc-soft)}
.unitcard .un{text-align:right;line-height:1.35}
.mode:hover,.unitcard:hover{border-color:var(--faint)}