/* रेल लेखा तैयारी — design tokens
   Loco blue + station-board yellow + signal green/red, self-hosted Mukta (body) & Khand (signage headings) */
@font-face{font-family:Mukta;font-weight:400;font-display:swap;src:url(fonts/mukta-devanagari-400-normal.woff2) format("woff2");unicode-range:U+0900-097F,U+1CD0-1CF9,U+200C-200D,U+20A8,U+20B9,U+20F0,U+25CC,U+A830-A839,U+A8E0-A8FF}
@font-face{font-family:Mukta;font-weight:400;font-display:swap;src:url(fonts/mukta-latin-400-normal.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215}
@font-face{font-family:Mukta;font-weight:500;font-display:swap;src:url(fonts/mukta-devanagari-500-normal.woff2) format("woff2");unicode-range:U+0900-097F,U+1CD0-1CF9,U+200C-200D,U+20A8,U+20B9,U+20F0,U+25CC,U+A830-A839,U+A8E0-A8FF}
@font-face{font-family:Mukta;font-weight:500;font-display:swap;src:url(fonts/mukta-latin-500-normal.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215}
@font-face{font-family:Mukta;font-weight:700;font-display:swap;src:url(fonts/mukta-devanagari-700-normal.woff2) format("woff2");unicode-range:U+0900-097F,U+1CD0-1CF9,U+200C-200D,U+20A8,U+20B9,U+20F0,U+25CC,U+A830-A839,U+A8E0-A8FF}
@font-face{font-family:Mukta;font-weight:700;font-display:swap;src:url(fonts/mukta-latin-700-normal.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215}
@font-face{font-family:Khand;font-weight:600;font-display:swap;src:url(fonts/khand-devanagari-600-normal.woff2) format("woff2");unicode-range:U+0900-097F,U+1CD0-1CF9,U+200C-200D,U+20A8,U+20B9,U+20F0,U+25CC,U+A830-A839,U+A8E0-A8FF}
@font-face{font-family:Khand;font-weight:600;font-display:swap;src:url(fonts/khand-latin-600-normal.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215}
@font-face{font-family:Khand;font-weight:700;font-display:swap;src:url(fonts/khand-devanagari-700-normal.woff2) format("woff2");unicode-range:U+0900-097F,U+1CD0-1CF9,U+200C-200D,U+20A8,U+20B9,U+20F0,U+25CC,U+A830-A839,U+A8E0-A8FF}
@font-face{font-family:Khand;font-weight:700;font-display:swap;src:url(fonts/khand-latin-700-normal.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215}

:root{
  --fs:17px;
  --loco:#13296b; --loco-2:#0c1b4a; --loco-soft:#e7ecf8;
  --board:#f7c200; --board-ink:#1a1400; --board-soft:#fff6d1;
  --go:#0f8a4f; --go-soft:#e2f4ea;
  --stop:#c62b1f; --stop-soft:#fbe6e3;
  --caution:#c77700; --caution-soft:#fff1d9;
  --violet:#5b3fb0; --violet-soft:#eee9fb;
  --sky:#1667c7; --sky-soft:#e3effd;
  --paper:#f3f5f9; --card:#ffffff; --ink:#151821; --muted:#5a6273; --line:#dde2ec;
  --rail:#8a93a6;
  --shadow:0 1px 0 rgba(19,41,107,.06),0 6px 18px -10px rgba(19,41,107,.25);
  --head:"Khand","Mukta",system-ui,sans-serif;
  --body:"Mukta","Noto Sans Devanagari","Nirmala UI",system-ui,sans-serif;
  --side:268px;
}
[data-theme="dark"]{
  --loco:#8fb0ff; --loco-2:#0b1430; --loco-soft:#1b2747;
  --board:#f7c200; --board-ink:#1a1400; --board-soft:#3a3214;
  --go:#4cc58a; --go-soft:#12321f; --stop:#ff8a7d; --stop-soft:#3a1714;
  --caution:#f2ae4b; --caution-soft:#36260d; --violet:#b9a4ff; --violet-soft:#271f45;
  --sky:#7fb5ff; --sky-soft:#13284a;
  --paper:#0f131c; --card:#171c28; --ink:#e9ecf3; --muted:#9ba4b6; --line:#2a3245; --rail:#4b556b;
  --shadow:none;
}
*{box-sizing:border-box}
html{font-size:var(--fs);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);line-height:1.6}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--sky)}
:focus-visible{outline:3px solid var(--board);outline-offset:2px}
.hide{display:none!important}

/* ---------- protection ---------- */
body.lock{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
body.lock input,body.lock textarea{-webkit-user-select:text;user-select:text}
body.lock img{pointer-events:none;-webkit-user-drag:none}
.wm{position:fixed;inset:0;pointer-events:none;z-index:40;background-repeat:repeat;opacity:.09}
[data-theme="dark"] .wm{opacity:.07}
.shield{position:fixed;inset:0;z-index:90;background:var(--loco-2);color:#fff;display:none;place-items:center;text-align:center;padding:24px}
.shield.on{display:grid}
.shield b{font-family:var(--head);font-size:1.6rem;display:block}
@media print{html,body{display:none!important}}

/* ---------- shell ---------- */
.side{display:none}
.top{position:sticky;top:0;z-index:30;background:var(--loco);color:#fff}
[data-theme="dark"] .top{background:#101a3a}
.top-in{display:flex;align-items:center;gap:4px;padding:8px 8px;min-height:56px;max-width:1180px;margin:0 auto}
.top h1{flex:1;margin:0 4px;font-family:var(--head);font-weight:600;font-size:1.25rem;line-height:1.15;letter-spacing:.01em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ib{width:42px;height:42px;border:0;border-radius:12px;background:transparent;color:inherit;display:grid;place-items:center;cursor:pointer;flex:none}
.ib:hover{background:rgba(255,255,255,.12)}
.ib svg{width:22px;height:22px}
.timer{font-variant-numeric:tabular-nums;font-weight:700;background:var(--board);color:var(--board-ink);padding:3px 10px;border-radius:8px}
.timer.low{background:var(--stop);color:#fff}
.main{max-width:1180px;margin:0 auto;padding:0 14px 110px}
.bnav{position:fixed;left:0;right:0;bottom:0;z-index:30;background:var(--card);border-top:1px solid var(--line);display:flex;padding:6px 4px calc(6px + env(safe-area-inset-bottom))}
.bnav button{flex:1;border:0;background:transparent;display:flex;flex-direction:column;align-items:center;gap:1px;font-size:.74rem;color:var(--muted);padding:4px 0;cursor:pointer;border-radius:10px}
.bnav svg{width:23px;height:23px}
.bnav button.on{color:var(--loco)}
.bnav button.on svg{background:var(--board);color:var(--board-ink);border-radius:9px;padding:2px 10px;width:43px;box-sizing:border-box}

@media (min-width:1000px){
  .side{display:flex;flex-direction:column;position:fixed;inset:0 auto 0 0;width:var(--side);background:var(--loco-2);color:#dfe6ff;padding:18px 14px;z-index:35}
  .top{margin-left:var(--side)}
  .main{margin-left:var(--side);padding:0 32px 60px;max-width:none}
  .main>.page{max-width:1100px;margin:0 auto}
  .bnav{display:none}
  .snav{display:flex;flex-direction:column;gap:2px;margin-top:22px}
  .snav button{display:flex;align-items:center;gap:12px;border:0;background:transparent;color:inherit;padding:10px 12px;border-radius:11px;cursor:pointer;font-size:.98rem;text-align:left}
  .snav button svg{width:21px;height:21px;opacity:.85}
  .snav button:hover{background:rgba(255,255,255,.07)}
  .snav button.on{background:var(--board);color:var(--board-ink);font-weight:700}
  .snav button.on svg{opacity:1}
  .suser{margin-top:auto;border-top:1px solid rgba(255,255,255,.12);padding-top:14px;display:flex;gap:10px;align-items:center}
  .suser .av{width:38px;height:38px;border-radius:50%;background:var(--board);color:var(--board-ink);display:grid;place-items:center;font-weight:700;flex:none}
  .suser b{display:block;font-size:.92rem;line-height:1.2}
  .suser small{display:block;font-size:.76rem;opacity:.7;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:150px}
}

/* station-board plate: the signature element */
.plate{background:var(--board);color:var(--board-ink);border-radius:6px;padding:8px 16px 6px;box-shadow:inset 0 0 0 3px var(--board-ink),inset 0 0 0 5px var(--board);text-align:center;font-family:var(--head)}
.plate .p-hi{display:block;font-weight:700;font-size:1.5rem;line-height:1.1}
.plate .p-en{display:block;font-weight:600;font-size:.86rem;letter-spacing:.14em;line-height:1.2;margin-top:2px}
.side .plate{position:relative;margin:4px 6px 0}
.side .plate::after{content:"";position:absolute;left:22%;right:22%;bottom:-14px;height:12px;border-left:4px solid #6f7891;border-right:4px solid #6f7891}

/* ---------- home ---------- */
.hello{display:grid;gap:14px;margin:16px 0 10px}
.hello-board{background:var(--loco);color:#fff;border-radius:18px;padding:18px;position:relative;overflow:hidden}
[data-theme="dark"] .hello-board{background:#14214a}
.hello-board .plate{display:inline-block;text-align:left;margin-bottom:12px}
.hello-board .plate .p-hi{font-size:1.45rem}
.hello-board p{margin:0;opacity:.85;font-size:.95rem;max-width:46ch}
.meter{display:flex;gap:18px;flex-wrap:wrap;margin-top:14px}
.meter div b{display:block;font-family:var(--head);font-size:1.8rem;line-height:1;font-weight:700}
.meter div span{font-size:.8rem;opacity:.8}
.track-deco{position:absolute;right:-30px;top:0;bottom:0;width:120px;opacity:.18;background:repeating-linear-gradient(0deg,transparent 0 14px,#fff 14px 17px);mask:linear-gradient(90deg,transparent 0 30%,#000 30% 38%,transparent 38% 62%,#000 62% 70%,transparent 70%);-webkit-mask:linear-gradient(90deg,transparent 0 30%,#000 30% 38%,transparent 38% 62%,#000 62% 70%,transparent 70%)}
.cont{display:flex;gap:12px;align-items:center;background:var(--card);border:1px solid var(--line);border-left:6px solid var(--go);border-radius:14px;padding:12px 14px;cursor:pointer;text-align:left;width:100%;box-shadow:var(--shadow)}
.cont small{display:block;color:var(--go);font-weight:700;font-size:.78rem}
.cont b{display:block;line-height:1.3}
.cont .arrow{margin-left:auto;color:var(--muted)}
.quick{display:flex;gap:8px;overflow-x:auto;padding:4px 0 6px;margin:10px 0 4px;scrollbar-width:none}
.quick::-webkit-scrollbar{display:none}
.qa{flex:none;display:flex;align-items:center;gap:8px;border:1px solid var(--line);background:var(--card);border-radius:12px;padding:9px 14px 9px 10px;cursor:pointer;font-weight:500}
.qa i{width:30px;height:30px;border-radius:9px;display:grid;place-items:center;font-style:normal}
.qa i svg{width:18px;height:18px}
.qa.m i{background:var(--stop-soft);color:var(--stop)}
.qa.q i{background:var(--board-soft);color:var(--caution)}
.qa.s i{background:var(--sky-soft);color:var(--sky)}
.qa.b i{background:var(--violet-soft);color:var(--violet)}
.search{display:flex;align-items:center;gap:8px;background:var(--card);border:1.5px solid var(--line);border-radius:14px;padding:3px 12px;margin:12px 0 4px}
.search:focus-within{border-color:var(--loco)}
.search svg{width:20px;height:20px;color:var(--muted);flex:none}
.search input{flex:1;border:0;outline:0;background:transparent;padding:10px 0;min-width:0}
.res{display:block;width:100%;text-align:left;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 12px;margin:6px 0;cursor:pointer}
.res small{display:block;color:var(--muted);font-size:.78rem}
mark{background:var(--board-soft);color:inherit;border-bottom:2px solid var(--board);padding:0 1px}

.h-sec{display:flex;align-items:baseline;justify-content:space-between;gap:10px;margin:26px 2px 8px}
.h-sec h2{margin:0;font-family:var(--head);font-weight:700;font-size:1.45rem;line-height:1.1;color:var(--loco)}
.h-sec span{color:var(--muted);font-size:.84rem}

/* route map of modules */
.route{list-style:none;margin:0;padding:0 0 0 30px;position:relative}
.route::before{content:"";position:absolute;left:11px;top:14px;bottom:14px;width:8px;border-left:2px solid var(--rail);border-right:2px solid var(--rail);background:repeating-linear-gradient(180deg,transparent 0 9px,var(--rail) 9px 11px)}
.stn{position:relative;margin:0 0 10px}
.stn .dot{position:absolute;left:-28px;top:18px;width:24px;height:24px;border-radius:50%;background:var(--card);border:4px solid var(--loco);z-index:1}
.stn.done .dot{background:var(--go);border-color:var(--go)}
.stn.cur .dot{background:var(--board);border-color:var(--board-ink)}
.stn-card{display:block;width:100%;text-align:left;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px 14px;cursor:pointer;box-shadow:var(--shadow)}
.stn-card:hover{border-color:var(--loco)}
.stn-top{display:flex;gap:10px;align-items:flex-start}
.stn-no{font-family:var(--head);font-weight:700;font-size:1.05rem;background:var(--loco);color:#fff;border-radius:6px;min-width:30px;height:28px;display:grid;place-items:center;flex:none;margin-top:1px}
[data-theme="dark"] .stn-no{color:#0b1430}
.stn-card b{display:block;font-size:1.04rem;line-height:1.3}
.stn-card .en{display:block;color:var(--muted);font-size:.8rem}
.stn-card .d{color:var(--muted);font-size:.84rem;line-height:1.45;margin-top:4px}
.prog{display:flex;align-items:center;gap:10px;margin-top:9px;font-size:.78rem;color:var(--muted)}
.prog .bar{flex:1;height:7px;background:var(--line);border-radius:7px;overflow:hidden;display:flex}
.prog .bar i{display:block;height:100%;background:var(--go)}
.prog .bar i.n{background:var(--sky)}
.tag{display:inline-flex;align-items:center;gap:4px;border-radius:999px;padding:1px 9px;font-size:.74rem;font-weight:700;white-space:nowrap}
.tag.go{background:var(--go-soft);color:var(--go)}
.tag.hard{background:var(--stop-soft);color:var(--stop)}
.tag.easy{background:var(--go-soft);color:var(--go)}
.tag.mk{background:var(--violet-soft);color:var(--violet)}

@media (min-width:1000px){
  .hello{grid-template-columns:1.6fr 1fr;align-items:stretch}
  .hello-board{padding:24px 26px}
  .route{display:grid;grid-template-columns:1fr 1fr;column-gap:18px;padding-left:0}
  .route::before{display:none}
  .stn .dot{display:none}
  .stn-card{height:100%}
}

/* ---------- module / topic lists ---------- */
.mhead{margin:18px 0 6px}
.mhead small{color:var(--muted);font-size:.85rem}
.mhead h2{margin:2px 0 0;font-family:var(--head);font-weight:700;font-size:1.7rem;line-height:1.15;color:var(--loco)}
.parts{display:grid;gap:8px}
.part{display:flex;gap:12px;align-items:flex-start;width:100%;text-align:left;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:11px 13px;cursor:pointer}
.part:hover{border-color:var(--loco)}
.part .n{font-family:var(--head);font-weight:700;width:30px;height:30px;border-radius:50%;background:var(--loco-soft);color:var(--loco);display:grid;place-items:center;flex:none}
.part.read .n{background:var(--go);color:#fff}
.part b{display:block;line-height:1.3}
.part .d{color:var(--muted);font-size:.82rem;line-height:1.45;margin-top:2px}
@media (min-width:1000px){.parts{grid-template-columns:1fr 1fr}}

.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px;margin:14px 0;box-shadow:var(--shadow)}
.sets{display:grid;grid-template-columns:repeat(auto-fill,minmax(88px,1fr));gap:8px;margin:12px 0}
.sets button{border:1.5px solid var(--line);background:var(--card);border-radius:12px;padding:8px 4px;cursor:pointer;line-height:1.25}
.sets button b{display:block;font-family:var(--head);font-size:1.1rem}
.sets button small{color:var(--muted);font-size:.75rem}
.sets button.full{border-color:var(--go);background:var(--go-soft)}
.sets button.part-done{border-color:var(--board)}

/* ---------- notes ---------- */
.reader{display:block}
.ptitle{margin:16px 0 8px}
.ptitle small{color:var(--muted);font-size:.84rem}
.ptitle h2{margin:2px 0 0;font-family:var(--head);font-weight:700;font-size:1.75rem;line-height:1.15;color:var(--loco)}
.toc{display:flex;gap:6px;overflow-x:auto;padding:4px 0 8px;scrollbar-width:none;position:sticky;top:56px;z-index:5;background:var(--paper)}
.toc::-webkit-scrollbar{display:none}
.toc button{flex:none;border:1px solid var(--line);background:var(--card);border-radius:999px;padding:4px 12px;font-size:.82rem;cursor:pointer;white-space:nowrap}
.toc button:hover,.toc button.on{border-color:var(--loco);color:var(--loco);background:var(--loco-soft)}
.notes{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:6px 18px 20px;box-shadow:var(--shadow)}
.notes>*{max-width:72ch}
.notes .tbl{max-width:none}
.notes h2{display:flex;gap:10px;align-items:flex-start;font-family:var(--head);font-weight:700;font-size:1.42rem;line-height:1.2;color:var(--loco);margin:30px 0 10px;padding-top:18px;border-top:2px dashed var(--line);max-width:none}
.notes h2:first-child{border-top:0;margin-top:10px;padding-top:6px}
.notes h2 .h2n{flex:none;background:var(--board);color:var(--board-ink);border-radius:5px;min-width:32px;height:30px;display:grid;place-items:center;font-size:1.05rem;box-shadow:inset 0 0 0 2px var(--board-ink)}
.notes h3{font-size:1.08rem;margin:22px 0 6px;color:var(--ink);display:flex;align-items:center;gap:8px}
.notes h3::before{content:"";width:6px;height:18px;border-radius:3px;background:var(--sky);flex:none}
.notes h3.sum::before{background:var(--board)}
.notes h3.ex::before{background:var(--go)}
.notes p,.notes li{line-height:1.78}
.notes ul,.notes ol{padding-left:1.35em}
.notes li{margin:4px 0}
.notes li::marker{color:var(--loco)}
.notes strong{color:var(--loco);font-weight:700}
[data-theme="dark"] .notes strong{color:#c9d7ff}
.tbl{overflow-x:auto;margin:12px 0;border:1px solid var(--line);border-radius:12px}
table{border-collapse:collapse;width:100%;font-size:.92rem}
th,td{padding:9px 11px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{background:var(--loco);color:#fff;font-weight:600}
[data-theme="dark"] th{background:#22315a}
tbody tr:nth-child(even) td{background:rgba(19,41,107,.035)}
tr:last-child td{border-bottom:0}
.notes th strong{color:inherit}
h3.sum+.tbl th{background:var(--board);color:var(--board-ink)}

/* callouts */
.co{margin:14px 0;padding:10px 14px 10px 14px;border-radius:12px;border:1px solid;border-left-width:6px}
.co p{margin:5px 0}
.co-h{display:flex;align-items:center;gap:7px;font-weight:700;font-size:.92rem}
.co-h svg{width:18px;height:18px;flex:none}
.co-simple{background:var(--violet-soft);border-color:var(--violet)}
.co-simple .co-h{color:var(--violet)}
.co-def{background:var(--sky-soft);border-color:var(--sky)}
.co-def .co-h{color:var(--sky)}
.co-ex{background:var(--go-soft);border-color:var(--go)}
.co-ex .co-h{color:var(--go)}
.co-mem{background:var(--board-soft);border-color:var(--board)}
.co-mem .co-h{color:var(--caution)}
.co-trap{background:var(--stop-soft);border-color:var(--stop)}
.co-trap .co-h{color:var(--stop)}
.co-note{background:var(--loco-soft);border-color:var(--loco)}
.co-note .co-h{color:var(--loco)}
.co-formula{background:var(--card);border-color:var(--caution);border-style:dashed;border-left-style:solid}
.co-formula .co-h{color:var(--caution)}
.co strong{color:inherit}

@media (min-width:1000px){
  .reader{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:26px;align-items:start}
  .reader .toc{position:sticky;top:76px;flex-direction:column;overflow:visible;padding:0;background:transparent;order:2;border-left:2px solid var(--line)}
  .reader .toc button{border:0;border-radius:0 8px 8px 0;background:transparent;text-align:left;white-space:normal;padding:5px 12px;margin-left:-2px;border-left:2px solid transparent}
  .reader .toc button.on,.reader .toc button:hover{border-left-color:var(--loco);background:var(--loco-soft)}
  .notes{padding:10px 34px 28px}
}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:11px 18px;min-height:48px;font-weight:700;cursor:pointer;background:var(--loco);color:#fff}
[data-theme="dark"] .btn{color:#0b1430}
.btn.sec{background:var(--card);color:var(--ink);border:1.5px solid var(--line)}
.btn.board{background:var(--board);color:var(--board-ink)}
.btn.go{background:var(--go);color:#fff}
.btn.block{width:100%}
.btn:disabled{opacity:.45;cursor:default}
.btn svg{width:20px;height:20px}
.row{display:flex;gap:8px;flex-wrap:wrap}
.row>.btn{flex:1}
.seg{display:inline-flex;background:var(--card);border:1px solid var(--line);border-radius:11px;padding:3px;gap:2px}
.seg button{border:0;background:transparent;padding:5px 11px;border-radius:8px;font-size:.84rem;font-weight:600;color:var(--muted);cursor:pointer}
.seg button.on{background:var(--loco);color:#fff}
[data-theme="dark"] .seg button.on{color:#0b1430}
.toolrow{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-top:14px}

/* ---------- question ---------- */
.qwrap{max-width:780px;margin:0 auto}
.qhead{display:flex;justify-content:space-between;align-items:center;gap:8px;margin:14px 0 8px}
.qn{font-family:var(--head);font-weight:700;font-size:1.15rem;color:var(--loco)}
.qn small{font-family:var(--body);font-weight:500;color:var(--muted);font-size:.8rem;margin-left:6px}
.qcard{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px;box-shadow:var(--shadow)}
.qtext{font-size:1.07rem;font-weight:600;line-height:1.6;margin:0 0 12px;white-space:pre-line}
.qtext .en,.opt .en{display:block;font-weight:400;color:var(--muted);font-size:.9em;margin-top:3px}
.opt{display:flex;gap:11px;align-items:flex-start;width:100%;text-align:left;background:var(--card);border:1.5px solid var(--line);border-radius:12px;padding:11px 12px;margin:8px 0;cursor:pointer;line-height:1.45}
.opt:hover:not(:disabled){border-color:var(--loco)}
.opt .k{width:30px;height:30px;border-radius:7px;border:1.5px solid var(--line);display:grid;place-items:center;font-family:var(--head);font-weight:700;flex:none}
.opt.sel{border-color:var(--loco);background:var(--loco-soft)}
.opt.sel .k{background:var(--loco);color:#fff;border-color:var(--loco)}
.opt.right{border-color:var(--go);background:var(--go-soft)}
.opt.right .k{background:var(--go);color:#fff;border-color:var(--go)}
.opt.wrong{border-color:var(--stop);background:var(--stop-soft)}
.opt.wrong .k{background:var(--stop);color:#fff;border-color:var(--stop)}
.opt:disabled{cursor:default}
.explain{border-radius:12px;padding:12px 14px;margin:12px 0 4px;background:var(--loco-soft);line-height:1.65;white-space:pre-line;border-left:5px solid var(--loco)}
.explain.ok{border-left-color:var(--go)}
.explain.bad{border-left-color:var(--stop)}
.explain b{display:block;margin-bottom:3px}
.explain.ok b{color:var(--go)}
.explain.bad b{color:var(--stop)}
.star{border:0;background:transparent;color:var(--muted);cursor:pointer;padding:6px;display:grid;place-items:center}
.star svg{width:25px;height:25px}
.star.on{color:var(--caution)}
.navrow{position:sticky;bottom:64px;display:flex;gap:8px;padding:14px 0 10px;background:linear-gradient(to top,var(--paper) 70%,transparent)}
.navrow .btn{flex:1}
@media (min-width:1000px){.navrow{bottom:0}}

/* palette, sheets, modals */
.overlay{position:fixed;inset:0;background:rgba(8,14,30,.6);z-index:60;display:flex;align-items:flex-end;justify-content:center}
.overlay.center{align-items:center}
.sheet{background:var(--card);width:100%;max-width:780px;max-height:85vh;overflow:auto;border-radius:20px 20px 0 0;padding:18px}
.sheet h3,.modal h3{margin:0 0 8px;font-family:var(--head);font-size:1.35rem}
.modal{background:var(--card);border-radius:18px;padding:20px;width:calc(100% - 32px);max-width:430px}
.modal p{color:var(--muted);margin:0 0 16px}
.pal{display:grid;grid-template-columns:repeat(auto-fill,minmax(44px,1fr));gap:7px;margin:10px 0}
.pal button{height:44px;border-radius:9px;border:1.5px solid var(--line);background:var(--card);cursor:pointer;font-weight:700}
.pal .a{background:var(--go);border-color:var(--go);color:#fff}
.pal .m{background:var(--violet);border-color:var(--violet);color:#fff}
.pal .v{background:var(--stop-soft);border-color:var(--stop)}
.pal .cur{outline:3px solid var(--board);outline-offset:1px}
.legend{display:flex;gap:12px;flex-wrap:wrap;font-size:.8rem;color:var(--muted)}
.legend i{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:4px;vertical-align:-1px}

/* results */
.score{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.score div{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 12px}
.score b{display:block;font-family:var(--head);font-size:1.7rem;line-height:1.1}
.score span{font-size:.82rem;color:var(--muted)}
.big{font-family:var(--head);font-size:3rem;font-weight:700;line-height:1;margin:6px 0}
.pass{color:var(--go)} .fail{color:var(--stop)}
.rev{border-left:5px solid var(--line);padding-left:12px;margin:16px 0}
.rev.r{border-color:var(--go)} .rev.w{border-color:var(--stop)}
.small{font-size:.85rem;color:var(--muted)}
.empty{text-align:center;color:var(--muted);padding:34px 10px}
.foot{font-size:.78rem;color:var(--muted);text-align:center;margin:30px 8px 0;line-height:1.55}
@media (min-width:640px){.score{grid-template-columns:repeat(4,1fr)}}

/* ---------- auth ---------- */
.auth{min-height:100vh;display:grid;background:var(--paper)}
.auth-side{background:var(--loco-2);color:#dfe6ff;padding:28px 22px 26px;position:relative;overflow:hidden}
.auth-side .plate{display:inline-block;text-align:left}
.auth-side .plate .p-hi{font-size:1.75rem}
.auth-side h2{font-family:var(--head);font-weight:600;font-size:1.35rem;line-height:1.25;margin:20px 0 6px;color:#fff;max-width:24ch}
.auth-side ul{margin:10px 0 0;padding:0;list-style:none;display:grid;gap:7px;font-size:.95rem}
.auth-side li{display:flex;gap:9px;align-items:flex-start}
.auth-side li::before{content:"";width:10px;height:10px;border-radius:50%;background:var(--board);margin-top:.5em;flex:none}
.auth-side .rails{position:absolute;left:0;right:0;bottom:0;height:16px;background:repeating-linear-gradient(90deg,#3d4a72 0 3px,transparent 3px 14px);border-top:2px solid #6f7891;border-bottom:2px solid #6f7891;opacity:.7}
.auth-main{padding:22px 18px 40px;display:flex;justify-content:center}
.auth-card{width:100%;max-width:420px}
.tabs{display:grid;grid-template-columns:1fr 1fr;background:var(--card);border:1px solid var(--line);border-radius:13px;padding:4px;margin-bottom:16px}
.tabs button{border:0;background:transparent;padding:9px;border-radius:10px;font-weight:700;color:var(--muted);cursor:pointer}
.tabs button.on{background:var(--loco);color:#fff}
.gbtn{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;min-height:48px;border:1.5px solid var(--line);background:var(--card);border-radius:12px;font-weight:700;cursor:pointer}
.gbtn svg{width:20px;height:20px}
.gwrap{display:flex;justify-content:center;min-height:44px}
.or{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:.84rem;margin:16px 0}
.or::before,.or::after{content:"";flex:1;height:1px;background:var(--line)}
.fld{display:block;margin:0 0 12px}
.fld span{display:block;font-weight:600;font-size:.9rem;margin-bottom:4px}
.fld input{width:100%;border:1.5px solid var(--line);background:var(--card);border-radius:12px;padding:11px 13px;outline:0}
.fld input:focus{border-color:var(--loco)}
.msg{border-radius:11px;padding:10px 12px;margin:0 0 12px;font-size:.92rem}
.msg.err{background:var(--stop-soft);color:var(--stop)}
.msg.ok{background:var(--go-soft);color:var(--go)}
.linkbtn{border:0;background:transparent;color:var(--sky);cursor:pointer;padding:4px 0;font-weight:600}
.legal{font-size:.78rem;color:var(--muted);margin-top:16px;line-height:1.5}
@media (min-width:900px){
  .auth{grid-template-columns:1.05fr 1fr}
  .auth-side{padding:56px 52px;display:flex;flex-direction:column;justify-content:center}
  .auth-side h2{font-size:2rem}
  .auth-main{align-items:center}
}

/* profile */
.prof{display:flex;gap:14px;align-items:center}
.prof .av{width:56px;height:56px;border-radius:50%;background:var(--board);color:var(--board-ink);display:grid;place-items:center;font-family:var(--head);font-weight:700;font-size:1.6rem;flex:none}
.list-row{display:flex;justify-content:space-between;gap:10px;padding:10px 0;border-bottom:1px solid var(--line)}
.list-row:last-child{border-bottom:0}

@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.side .plate .p-hi{font-size:1.32rem}
.side .plate .p-en{font-size:.7rem;letter-spacing:.08em}
.notes h2 .h2n{padding:0 6px}

/* ---------- components used in Group B notes (imported) ---------- */
.notes .gb-two,.notes .gb-three{display:grid;gap:12px;margin:12px 0;max-width:none}
@media (min-width:700px){.notes .gb-two{grid-template-columns:1fr 1fr}.notes .gb-three{grid-template-columns:repeat(3,1fr)}}
.notes .gb-card{border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:var(--paper)}
.notes .gb-card h4{margin:0 0 6px;color:var(--loco);font-size:1rem}
.notes .gb-card p:first-of-type{margin-top:0}
.notes .gb-region.gb-a{border-top:4px solid var(--sky)}
.notes .gb-region.gb-b{border-top:4px solid var(--go)}
.notes .gb-region.gb-c{border-top:4px solid var(--caution)}
.notes .gb-flow{display:flex;flex-wrap:wrap;align-items:stretch;gap:8px 26px;margin:14px 0;max-width:none}
.notes .gb-flow span{position:relative;background:var(--loco-soft);border:1px solid var(--loco);border-radius:9px;padding:6px 11px;font-size:.9rem;font-weight:500}
.notes .gb-flow span:not(:last-child)::after{content:"→";position:absolute;right:-20px;top:50%;transform:translateY(-50%);color:var(--caution);font-weight:700}
.notes .gb-timeline{border-left:3px solid var(--rail);margin:12px 0 12px 6px;padding-left:18px}
.notes .gb-timeline div{position:relative;margin:8px 0}
.notes .gb-timeline div::before{content:"";position:absolute;left:-26px;top:.5em;width:12px;height:12px;border-radius:50%;background:var(--board);border:2px solid var(--board-ink)}
.notes .gb-timeline strong{margin-right:6px}
.notes .gb-tacct{display:grid;grid-template-columns:1fr 1fr;border-top:2px solid var(--ink);margin:8px 0;max-width:none}
.notes .gb-tacct>div{padding:6px 8px;display:flex;flex-direction:column;gap:3px;font-size:.9rem}
.notes .gb-tacct>div:first-child{border-right:2px solid var(--ink)}
.notes .gb-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin:12px 0;max-width:none}
.notes .gb-stats div{background:var(--loco-soft);border-radius:12px;padding:10px 12px;display:flex;flex-direction:column}
.notes .gb-stats .gb-big{font-family:var(--head);font-size:1.6rem;font-weight:700;color:var(--loco);line-height:1.1}
.notes .gb-stats span:last-child{font-size:.84rem;color:var(--muted)}
.notes .gb-code-strip{display:inline-flex;flex-wrap:wrap;gap:4px;margin:8px 0}
.notes .gb-code-strip span{display:flex;flex-direction:column;align-items:center;border:1px solid var(--line);border-radius:8px;padding:4px 10px;background:var(--paper);font-size:.8rem}
.notes .gb-code-strip strong{font-size:1.2rem;letter-spacing:.05em}
.notes .gb-stack div{padding:6px 10px;border:1px solid var(--line);border-radius:9px;margin:4px 0;background:var(--paper)}
.notes .gb-stack div:last-child{border-color:var(--loco)}
.notes table.gb-compact td,.notes table.gb-compact th{padding:5px 9px}
.notes .gb-tight li{margin:1px 0}
.notes .gb-num{text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}
.notes .gb-small{font-size:.86rem;color:var(--muted)}
.notes .gb-muted{color:var(--muted)}
.notes h4{font-size:1rem;margin:14px 0 4px;color:var(--loco)}
.auth-wrap{width:100%;max-width:420px}.auth-wrap .auth-card{max-width:none}
.legal-links{text-align:center;margin:16px 0 4px}.legal-links a{color:var(--muted,#5a6273)}.legal-links .btn{color:inherit}
.legal-page{max-width:760px;margin:0 auto;padding:22px 18px 48px;line-height:1.75}
.legal-page h1{font-family:var(--head);font-size:1.7rem;margin:6px 0 2px}
.legal-page h2{font-family:var(--head);font-size:1.2rem;margin:26px 0 6px}
.legal-page ul{padding-left:1.2em}.legal-page li{margin:4px 0}
.legal-page hr{border:0;border-top:1px solid var(--line);margin:28px 0 10px}