/* ===== additions for the full site ===== */
main{min-height:60vh}
.crumbs{display:flex;gap:8px;flex-wrap:wrap;color:var(--muted);font-weight:700;font-size:.92rem;padding-top:22px}
.crumbs a{color:var(--link);text-decoration:none}
.crumbs a:hover{text-decoration:underline}
.page-head{padding-block:16px 8px}
.page-head h1{font-size:clamp(1.7rem,3.4vw,2.5rem);font-weight:900}
.page-head p{color:var(--muted);margin:6px 0 0;max-width:40em}
.empty{background:var(--surface);border:2px dashed var(--line);border-radius:20px;padding:28px;text-align:center;color:var(--muted);font-weight:700}
.lesson-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px}
.lcard{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:18px 20px;display:flex;flex-direction:column;gap:10px;box-shadow:var(--shadow);min-width:0}
.lcard h3{font-size:1.15rem}
.lcard p{margin:0;color:var(--muted);font-size:.95rem}
.lcard .row{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:auto}
.grade-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
.gcard{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:18px;text-align:center;text-decoration:none;color:var(--ink);font-weight:900;font-size:1.15rem;box-shadow:var(--shadow)}
.gcard:hover{border-color:var(--gold);transform:translateY(-2px)}
.gcard small{display:block;color:var(--muted);font-weight:700;font-size:.82rem;margin-top:2px}
.group-t{font-size:1.2rem;font-weight:900;margin:26px 0 10px;color:var(--ink)}

/* lesson page */
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}
.tab{border:2px solid var(--line);background:var(--surface);color:var(--ink);border-radius:999px;padding:8px 22px;font-weight:800;cursor:pointer}
.tab[aria-selected="true"]{background:var(--deep);border-color:var(--deep);color:#fff}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:var(--shadow)}
.vid{width:100%;aspect-ratio:16/9;border:0;border-radius:16px;background:#000;display:block}
.vlist{list-style:none;margin:16px 0 0;padding:0;display:grid;gap:8px}
.vlist a{display:flex;gap:10px;align-items:center;text-decoration:none;background:var(--pale);border-radius:12px;padding:10px 14px;font-weight:700;color:var(--ink)}
.vlist a:hover{background:var(--gold-wash)}
.ws{display:grid;gap:10px}
.ws a{display:flex;align-items:center;gap:12px;background:var(--pale);border-radius:14px;padding:12px 16px;text-decoration:none;color:var(--ink);font-weight:800}
.ws a small{margin-inline-start:auto;color:var(--muted);font-weight:700}
.ws a:hover{background:var(--gold-wash)}
.tag-sample{display:inline-block;background:var(--gold-wash);color:var(--gold);border:1px solid var(--gold);border-radius:999px;padding:1px 12px;font-size:.8rem;font-weight:800;margin-inline-start:8px}

/* quiz */
.qbar{display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap;color:var(--muted);font-weight:700;margin-bottom:12px}
.qtext{font-size:1.25rem;font-weight:800;margin:0 0 14px}
.opts{display:grid;gap:10px}
.opt{text-align:start;border:2px solid var(--line);background:var(--bg);border-radius:14px;padding:12px 16px;font-weight:700;font-size:1.05rem;cursor:pointer}
.opt:hover:not([disabled]){border-color:var(--gold)}
.opt.right{border-color:var(--ok);background:rgba(15,122,85,.12)}
.opt.wrong{border-color:var(--bad);background:rgba(192,42,42,.1)}
.why{margin-top:14px;padding:12px 16px;border-radius:14px;background:var(--pale);font-weight:700}
.score{font-size:3rem;font-weight:900;font-family:var(--math);direction:ltr;text-align:center;color:var(--link)}
.center{text-align:center}

/* games */
.gwrap{max-width:720px;margin-inline:auto}
.big{font-size:2.4rem;font-weight:900;text-align:center;direction:ltr;font-family:var(--math);margin:12px 0}
.ans-in{width:100%;border:3px solid var(--line);background:var(--bg);border-radius:16px;padding:12px;font-size:1.6rem;text-align:center;direction:ltr}
.hud{display:flex;justify-content:space-between;gap:8px;font-weight:800;color:var(--muted);flex-wrap:wrap}
.hud b{color:var(--ink);font-family:var(--math)}
.lvl{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin:14px 0}
.sud{display:grid;grid-template-columns:repeat(4,1fr);gap:4px;max-width:320px;margin:16px auto;direction:ltr;background:var(--deep);padding:4px;border-radius:14px}
.sud input{width:100%;aspect-ratio:1;text-align:center;font-size:1.5rem;font-weight:800;border:0;border-radius:8px;background:var(--surface);color:var(--ink);padding:0;font-family:var(--math)}
.sud input[readonly]{background:var(--pale);color:var(--link)}
.sud input.bad{background:rgba(192,42,42,.2)}
.sud .b2{margin-inline-end:3px}
.mem{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:16px 0}
.mcard{aspect-ratio:1.1;border:0;border-radius:14px;font-weight:800;font-size:.95rem;cursor:pointer;background:var(--deep);color:var(--gold-soft);padding:6px;display:grid;place-items:center;line-height:1.3}
.mcard.open{background:var(--surface);color:var(--ink);border:2px solid var(--gold)}
.mcard.done{background:#d8f5e8;color:#0b6b49;border:2px solid var(--ok)}
.mcard .num{font-size:1.05rem}

/* achievements, install bar */
.ach{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.ach div{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:16px;text-align:center;box-shadow:var(--shadow)}
.ach strong{display:block;font-size:2rem;font-family:var(--math);direction:ltr;color:var(--link);line-height:1.2}
.ach span{color:var(--muted);font-weight:700;font-size:.9rem}
.install{display:none;background:var(--gold-wash);border-bottom:2px solid var(--gold);padding:8px 16px;text-align:center;font-weight:700;font-size:.92rem;margin-inline:calc(-1*max(16px,env(safe-area-inset-left,0px)))}
.install.show{display:block}
.install button{border:0;background:var(--deep);color:#fff;border-radius:999px;padding:3px 14px;font-weight:800;cursor:pointer;margin-inline-start:8px}
.install .x2{background:transparent;color:var(--ink);padding:0 8px}
.ad img{max-width:100%;height:auto;border-radius:12px;display:block}
.ad a{display:block}
.nav a.on{background:rgba(255,255,255,.18);color:#fff}
@media (max-width:860px){.mem{grid-template-columns:repeat(3,1fr)}}

/* standalone-page reset and phone nav */
html,body{margin:0}
body{-webkit-text-size-adjust:100%}
@media (max-width:560px){
  .nav a{font-size:.82rem;padding:5px 9px}
  .nav{width:100%;flex-wrap:wrap;overflow:visible;justify-content:flex-start}
  .bar .wrap{gap:8px}
}

/* logo */
.brand .logo{width:52px;height:52px;flex:none;background:#fff;border-radius:50%;padding:2px;box-shadow:0 0 0 2px var(--gold)}
.flogo{display:flex;gap:14px;align-items:center}
.flogo img{width:96px;height:96px;background:#fff;border-radius:50%;padding:4px;flex:none}