/* LIMBA - Written Mongolian course (200 lessons). One stylesheet for the whole course. */
:root{
  --ink:#1b2433; --soft:#5a6475; --line:#e3e7ee; --bg:#f6f8fb; --card:#fff;
  --blue:#0b4f9c; --blue-d:#0a3266; --sky:#e8f1fb; --red:#d62839; --red-d:#a91d2b;
  --gold:#ffc83d; --green:#1f9d63; --green-l:#e6f6ee; --bad:#c62f3f; --bad-l:#fdecee;
  --r:16px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:Montserrat,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;font-size:17px}
a{color:var(--blue)}
.wrap{max-width:980px;margin:0 auto;padding:0 20px}
.mn{font-family:"Segoe UI",Roboto,"Noto Sans",Arial,sans-serif;font-weight:600;color:var(--blue-d)}

/* top bar */
.bar{background:var(--blue-d);color:#fff;position:sticky;top:0;z-index:20;box-shadow:0 2px 10px rgba(0,0,0,.15)}
.bar-in{display:flex;align-items:center;gap:14px;height:60px}
.brand{display:flex;align-items:center;gap:9px;color:#fff;text-decoration:none;font-weight:800;letter-spacing:.5px}
.brand img{border-radius:7px}
.bar-nav{display:flex;gap:6px;margin-left:auto;align-items:center}
.bar-nav a{color:#dfe9f7;text-decoration:none;font-weight:600;font-size:14px;padding:8px 10px;border-radius:9px}
.bar-nav a:hover{background:rgba(255,255,255,.1);color:#fff}
.bar-nav a.bar-cta{background:var(--red);color:#fff;padding:9px 14px}
.bar-nav a.bar-cta:hover{background:var(--red-d)}
@media(max-width:640px){.bar-nav a.hide-s{display:none}.brand span{display:none}}

/* hero */
.hero{background:linear-gradient(135deg,#0b4f9c 0%,#0a3266 100%);color:#fff;padding:26px 0 30px}
.crumb{font-size:13px;color:#bcd0ea;margin-bottom:12px}
.crumb a{color:#dbe7f6;text-decoration:none}
.crumb a:hover{text-decoration:underline}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:10px}
.chip{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);padding:4px 11px;border-radius:999px;font-size:13px;font-weight:700}
.chip.lvl{background:var(--gold);color:#3a2a00;border-color:var(--gold)}
.hero h1{font-size:34px;line-height:1.2;margin:4px 0 10px;font-weight:800}
.hero .goal{margin:0;color:#e4edf9;font-size:17px}
.prog{margin-top:18px;height:8px;background:rgba(255,255,255,.18);border-radius:9px;overflow:hidden}
.prog span{display:block;height:100%;background:var(--gold);border-radius:9px}
.prog-txt{font-size:12px;color:#bcd0ea;margin-top:6px}
@media(max-width:640px){.hero h1{font-size:27px}}

/* quick lesson nav (top) */
.qnav{display:flex;gap:10px;justify-content:space-between;margin:18px 0 0}
.qnav a{flex:1;text-align:center;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px;text-decoration:none;font-weight:700;font-size:14px;color:var(--blue-d)}
.qnav a:hover{border-color:var(--blue)}
.qnav a.off{visibility:hidden}

/* THE CALL TO ACTION */
.cta{margin:22px 0;border-radius:22px;background:linear-gradient(120deg,#d62839 0%,#b21e2e 55%,#7d1220 100%);color:#fff;padding:28px;display:grid;grid-template-columns:120px 1fr;gap:24px;align-items:center;box-shadow:0 14px 34px rgba(166,24,40,.28);position:relative;overflow:hidden}
.cta:before{content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;background:rgba(255,200,61,.16)}
.cta-ico{width:120px;height:120px;border-radius:50%;background:rgba(255,255,255,.12);display:flex;align-items:center;justify-content:center}
.cta-ico svg{width:72px;height:72px}
.cta-over{margin:0 0 4px;font-size:13px;font-weight:800;letter-spacing:1.5px;text-transform:uppercase;color:var(--gold)}
.cta h2{margin:0 0 8px;font-size:28px;line-height:1.2;font-weight:800}
.cta p.cta-lead{margin:0 0 18px;color:#ffe4e7;font-size:16px}
.cta-btn{display:inline-flex;flex-direction:column;align-items:flex-start;background:var(--gold);color:#2b1d00;text-decoration:none;border-radius:16px;padding:16px 28px;font-weight:800;font-size:21px;line-height:1.2;box-shadow:0 6px 0 #c99412,0 12px 24px rgba(0,0,0,.25);transition:transform .12s,box-shadow .12s;position:relative;z-index:1}
.cta-btn:hover{transform:translateY(-2px);box-shadow:0 8px 0 #c99412,0 16px 28px rgba(0,0,0,.28)}
.cta-btn small{font-size:13px;font-weight:600;color:#5b4300;margin-top:4px}
.cta-try{margin-top:16px;display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-size:14px;color:#ffe4e7;position:relative;z-index:1}
.cta-try audio{height:36px;max-width:100%}
@media(max-width:700px){.cta{grid-template-columns:1fr;padding:24px 20px;text-align:left}.cta-ico{width:76px;height:76px}.cta-ico svg{width:46px;height:46px}.cta h2{font-size:23px}.cta-btn{width:100%;align-items:center;text-align:center;font-size:19px}}

/* sticky mobile CTA */
.stick{position:fixed;left:0;right:0;bottom:0;z-index:30;background:#fff;border-top:1px solid var(--line);box-shadow:0 -6px 18px rgba(0,0,0,.1);padding:10px 14px;display:none}
.stick a{display:block;text-align:center;background:var(--red);color:#fff;text-decoration:none;font-weight:800;border-radius:12px;padding:13px;font-size:16px}
@media(max-width:700px){.stick{display:block}body{padding-bottom:76px}}

/* cards and sections */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px;margin:22px 0;box-shadow:0 2px 8px rgba(16,30,54,.04)}
.card h2{margin:0 0 14px;font-size:23px;font-weight:800;display:flex;align-items:center;gap:10px}
.card h2 .n{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;background:var(--sky);color:var(--blue);font-size:15px;flex:0 0 32px}
.card h3{font-size:18px;margin:20px 0 8px}

/* story */
.story{display:grid;grid-template-columns:300px 1fr;gap:24px;align-items:center}
.story svg{width:100%;height:auto;border-radius:14px;display:block}
.story p{margin:0 0 10px}
.story .diary{font-size:13px;font-weight:800;color:var(--soft);text-transform:uppercase;letter-spacing:1px;margin-bottom:6px}
@media(max-width:700px){.story{grid-template-columns:1fr}}

/* dialogue */
.dlg{display:flex;flex-direction:column;gap:10px}
.line{display:flex;gap:12px;align-items:flex-start}
.who{flex:0 0 auto;min-width:74px;font-weight:800;font-size:14px;color:var(--soft);padding-top:9px}
.bub{background:var(--sky);border-radius:14px;padding:9px 14px;max-width:640px}
.line.me .bub{background:#fff6dc}
.bub .mn{font-size:19px;display:block}
.bub .en{font-size:14px;color:var(--soft)}
.toggle{margin-bottom:14px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 14px;font:inherit;font-size:13px;font-weight:700;cursor:pointer;color:var(--blue)}
.hide-en .bub .en{display:none}

/* vocab */
table{border-collapse:collapse;width:100%}
.voc td,.voc th,.gt td,.gt th{border-bottom:1px solid var(--line);padding:9px 10px;text-align:left;vertical-align:top}
.voc th,.gt th{font-size:13px;text-transform:uppercase;letter-spacing:.6px;color:var(--soft)}
.voc td.mn{font-size:19px;white-space:nowrap}
.voc td.tr{color:var(--soft);font-size:14px;font-style:normal;white-space:nowrap}
.gt td{font-size:16px}
.tbl{overflow-x:auto}

/* grammar */
.gr p{margin:0 0 12px}
.gr ul{margin:0 0 12px;padding-left:22px}
.ex{border-left:4px solid var(--blue);background:#f7faff;border-radius:0 12px 12px 0;padding:10px 14px;margin:10px 0}
.ex .mn{font-size:19px;display:block}
.ex .gl{font-size:13px;color:var(--soft);letter-spacing:.3px;display:block}
.ex .en{font-size:15px;display:block}
.tip{background:#fff8e6;border:1px solid #f6dd9b}
.tip h2 .n{background:#ffe9a8;color:#7a5600}
.ref{font-size:14px;color:var(--soft);margin-top:14px}

/* exercises */
.exo ol{padding-left:22px;margin:0}
.exo li{margin:0 0 18px}
.exo .q{display:block;font-weight:600;margin-bottom:8px}
.exo li button{font:inherit;font-size:16px;background:#fff;border:1.5px solid var(--line);border-radius:10px;padding:8px 14px;margin:0 8px 8px 0;cursor:pointer;color:var(--ink)}
.exo li button:hover{border-color:var(--blue)}
.exo li button.choisi{border-color:var(--blue);background:var(--sky)}
.exo.corrige li button.bonne{border-color:var(--green);background:var(--green-l)}
.exo.corrige li.faux button.choisi{border-color:var(--bad);background:var(--bad-l)}
.exo-note{margin:4px 0 0;font-size:14px;color:var(--bad);background:var(--bad-l);padding:8px 12px;border-radius:9px}
.exo-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:6px}
.exo-actions button{font:inherit;font-weight:800;border:0;border-radius:12px;padding:12px 20px;cursor:pointer}
.exo-corriger{background:var(--blue);color:#fff}
.exo-refaire{background:#eef1f6;color:var(--ink)}
.exo-score{font-weight:800;font-size:20px;display:none}
.exo-score.visible{display:inline}
.pr ol{padding-left:22px;margin:0}
.pr li{margin:0 0 14px}
.pr details{display:inline-block;margin-left:6px}
.pr summary{cursor:pointer;color:var(--blue);font-weight:700;font-size:14px;display:inline}
.pr .ans{display:block;margin-top:6px;background:var(--green-l);border-radius:9px;padding:7px 12px}
.done-msg{display:none;margin-top:12px;background:var(--green-l);color:#0f6b41;border-radius:12px;padding:12px 16px;font-weight:700}
.done-msg.on{display:block}

/* lesson nav */
.lnav{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:26px 0}
.lnav a{display:block;background:var(--card);border:1.5px solid var(--line);border-radius:16px;padding:16px 18px;text-decoration:none;color:var(--ink)}
.lnav a:hover{border-color:var(--blue);box-shadow:0 4px 14px rgba(11,79,156,.12)}
.lnav small{display:block;font-size:12px;font-weight:800;color:var(--soft);text-transform:uppercase;letter-spacing:1px}
.lnav b{display:block;font-size:17px;margin-top:3px}
.lnav .next{text-align:right;background:var(--blue);border-color:var(--blue);color:#fff}
.lnav .next small{color:#cfe0f5}
.lnav .ph{visibility:hidden}
.map-link{text-align:center;margin:-8px 0 20px}
.map-link a{font-weight:700}

/* unit box */
.unit ol{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:1fr 1fr;gap:6px 18px}
.unit li a{display:flex;gap:10px;text-decoration:none;color:var(--ink);padding:7px 10px;border-radius:10px;font-size:15px}
.unit li a:hover{background:var(--sky)}
.unit li a .k{color:var(--soft);font-weight:700;min-width:34px}
.unit li.cur a{background:var(--sky);font-weight:800}
.unit li.ok a .k:after{content:" \2713";color:var(--green)}
@media(max-width:640px){.unit ol{grid-template-columns:1fr}.lnav{grid-template-columns:1fr}}

/* course map (index) */
.lvl{margin:30px 0 10px;display:flex;align-items:center;gap:14px}
.lvl .badge{background:var(--gold);color:#3a2a00;font-weight:800;border-radius:12px;padding:6px 12px;font-size:18px}
.lvl h2{margin:0;font-size:25px}
.lvl p{margin:0;color:var(--soft);font-size:15px}
.units{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.ucard{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px}
.ucard h3{margin:0 0 4px;font-size:17px}
.ucard .us{font-size:13px;color:var(--soft);margin:0 0 10px}
.ucard ol{list-style:none;margin:0;padding:0}
.ucard li a{display:flex;gap:10px;padding:5px 6px;border-radius:8px;text-decoration:none;color:var(--ink);font-size:15px}
.ucard li a:hover{background:var(--sky)}
.ucard li a .k{color:var(--soft);font-weight:700;min-width:30px}
.ucard li.ok a .k:after{content:" \2713";color:var(--green)}
.ucard li.rev a{font-weight:700}
@media(max-width:700px){.units{grid-template-columns:1fr}}
.start{display:inline-block;background:var(--gold);color:#2b1d00;font-weight:800;text-decoration:none;border-radius:14px;padding:14px 22px;margin-top:16px;font-size:18px}
.how{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.how div{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px;font-size:15px}
.how b{display:block;color:var(--blue);font-size:15px;margin-bottom:4px}
@media(max-width:800px){.how{grid-template-columns:1fr 1fr}}

/* footer */
.foot{background:#0d1a2e;color:#b9c4d6;margin-top:40px;padding:30px 0;font-size:14px}
.foot a{color:#dfe7f3}
.foot-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.foot h4{color:#fff;margin:0 0 8px}
.foot ul{list-style:none;margin:0;padding:0}
.foot li{margin:4px 0}
@media(max-width:700px){.foot-cols{grid-template-columns:1fr}}
.hero .mn,.cta .mn,.lnav .next .mn,.bar .mn,.foot .mn{color:inherit}

/* ===== navigation v2 ===== */
.bar-in{height:64px}
.nb{display:flex;align-items:stretch;gap:8px;margin:0 auto}
.bar-nav{margin-left:0}
.nb-btn{display:flex;align-items:center;gap:8px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.28);color:#fff;text-decoration:none;font-weight:800;border-radius:12px;padding:0 16px;height:46px;font-size:15px}
.nb-btn:hover{background:rgba(255,255,255,.24)}
.nb-next{background:var(--gold);color:#2b1d00;border-color:var(--gold)}
.nb-next:hover{background:#ffd666}
.nb-off{opacity:.3}
.nb-ar{font-size:21px;line-height:1}
.nb-all{display:flex;flex-direction:column;justify-content:center;align-items:center;text-decoration:none;color:#fff;background:rgba(0,0,0,.2);border:1px solid rgba(255,255,255,.28);border-radius:12px;padding:0 16px;height:46px;min-width:136px;line-height:1.15}
.nb-all:hover{background:rgba(0,0,0,.32)}
.nb-num{font-weight:800;font-size:15px;white-space:nowrap}
.nb-of{opacity:.75;font-weight:600}
.nb-sub{font-size:11px;color:#d3e3f7;font-weight:700;letter-spacing:.3px;white-space:nowrap}
@media(max-width:700px){.bar-nav{display:none}.bar-in{gap:10px}.nb-btn{padding:0 13px}}
@media(max-width:480px){.nb-prev .nb-t{display:none}.nb-all{min-width:0;padding:0 12px}}
@media(max-width:350px){.nb-next .nb-t{display:none}}
.steps{margin:16px 0 4px;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.steps-t{font-size:12px;font-weight:800;color:#cfe0f5;text-transform:uppercase;letter-spacing:.8px}
.steps ol{list-style:none;margin:0;padding:0;display:flex;gap:6px;flex-wrap:wrap}
.steps a{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;background:rgba(255,255,255,.12);border:1.5px solid rgba(255,255,255,.32);color:#fff;text-decoration:none;font-weight:800;font-size:13px}
.steps a:hover{background:rgba(255,255,255,.26)}
.steps li.rev a{border-radius:10px}
.steps li.ok a{background:var(--green);border-color:var(--green)}
.steps li.cur a{background:var(--gold);border-color:#fff;color:#2b1d00;box-shadow:0 0 0 3px rgba(255,200,61,.35)}
@media(max-width:480px){.steps ol{gap:4px}.steps a{width:28px;height:28px;font-size:11px}}
.lnav{grid-template-columns:1fr 1.6fr}
.lnav .next b{font-size:19px}
.map-link{font-size:15px}
.dr{position:fixed;top:0;right:0;bottom:0;left:0;z-index:60}
.dr[hidden]{display:none}
html.dr-on{overflow:hidden}
.dr-back{position:absolute;top:0;right:0;bottom:0;left:0;background:rgba(10,20,40,.55)}
.dr-panel{position:absolute;top:0;right:0;bottom:0;width:460px;max-width:100%;background:#fff;display:flex;flex-direction:column;box-shadow:-10px 0 30px rgba(0,0,0,.25)}
.dr-head{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;background:var(--blue-d);color:#fff}
.dr-head h2{margin:0;font-size:20px}
.dr-x{background:none;border:0;color:#fff;font-size:32px;line-height:1;cursor:pointer;padding:0 6px}
.dr-tools{padding:14px 20px;border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:10px}
.dr-q{font:inherit;font-size:16px;padding:12px 14px;border:2px solid var(--line);border-radius:12px;width:100%}
.dr-q:focus{outline:none;border-color:var(--blue)}
.dr-resume{display:block;background:var(--gold);color:#2b1d00;font-weight:800;text-decoration:none;border-radius:12px;padding:10px 14px;font-size:14px}
.dr-tabs{display:flex;gap:8px}
.dr-tabs button{flex:1;font:inherit;font-weight:800;border:1.5px solid var(--line);background:#fff;border-radius:10px;padding:8px 0;cursor:pointer;color:var(--blue-d)}
.dr-tabs button:hover{border-color:var(--blue);background:var(--sky)}
.dr-list{flex:1;overflow-y:auto;padding:6px 12px 30px;-webkit-overflow-scrolling:touch}
.dr-lvl{font-size:13px;text-transform:uppercase;letter-spacing:1px;color:var(--soft);margin:16px 8px 6px}
.dr-unit{border:1px solid var(--line);border-radius:12px;margin:6px 0;background:#fff}
.dr-unit summary{cursor:pointer;padding:11px 12px;display:flex;gap:8px;align-items:center;font-weight:700;list-style:none}
.dr-unit summary::-webkit-details-marker{display:none}
.dr-unit summary:before{content:"\25B8";color:var(--blue)}
.dr-unit[open] summary:before{content:"\25BE"}
.dr-un{color:var(--blue);font-weight:800;white-space:nowrap}
.dr-name{flex:1}
.dr-c{font-size:12px;color:var(--soft);font-weight:700;white-space:nowrap}
.dr-unit ol{list-style:none;margin:0;padding:0 8px 8px}
.dr-unit li a{display:flex;gap:10px;padding:8px 10px;border-radius:9px;text-decoration:none;color:var(--ink);font-size:15px}
.dr-unit li a:hover{background:var(--sky)}
.dr-unit li a.cur{background:var(--blue);color:#fff}
.dr-unit li a.cur .k{color:#fff}
.dr-unit li .k{min-width:32px;font-weight:800;color:var(--soft)}
.dr-unit li.ok .k:after{content:" \2713";color:var(--green)}
.dr-none{padding:20px;color:var(--soft)}
.starts{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.starts .start{margin-top:0}
.start[hidden]{display:none}
.start-alt{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.6);padding:12px 20px}
.start-find{background:rgba(255,255,255,.12);color:#fff;border:2px solid rgba(255,255,255,.35);padding:12px 20px}
.lvl-tabs{position:sticky;top:64px;z-index:15;display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:18px 0 0;background:var(--bg);padding:10px 0}
.lvl-tabs a{display:flex;flex-direction:column;align-items:center;background:#fff;border:1.5px solid var(--line);border-radius:12px;padding:8px 4px;text-decoration:none;color:var(--ink)}
.lvl-tabs a:hover{border-color:var(--blue);background:var(--sky)}
.lvl-tabs b{font-size:18px;color:var(--blue)}
.lvl-tabs span{font-size:12px;color:var(--soft);font-weight:600;text-align:center}
.lvl,.ucard{scroll-margin-top:150px}
.u-done{color:var(--green);font-weight:700}.start.resume{box-shadow:0 6px 0 #c99412}