/* nauc-sa.sk — štúdijný web (Fáza 2). Mobile-first, friendly. */
:root{
  --bg:#0f172a; --bg2:#1e293b; --card:#ffffff; --ink:#0f172a; --muted:#64748b;
  --brand:#2563eb; --brand2:#7c3aed; --ok:#16a34a; --warn:#d97706; --bad:#dc2626;
  --ring:#bfdbfe; --soft:#f1f5f9; --line:#e2e8f0; --radius:16px;
  --maxw:880px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  color:var(--ink);background:var(--soft);line-height:1.6;-webkit-text-size-adjust:100%}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto}

/* layout */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 16px}
header.site{background:linear-gradient(120deg,var(--brand),var(--brand2));color:#fff}
header.site .wrap{display:flex;align-items:center;gap:12px;padding:14px 16px;flex-wrap:wrap}
header.site a{color:#fff}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.25rem;letter-spacing:-.02em}
.brandlogo{height:30px;width:30px;display:block;background:#fff;border-radius:8px;padding:3px}
.sponsor{margin-top:8px;font-weight:600}
.sponsor a{color:#fff;text-decoration:underline}
.nav{margin-left:auto;display:flex;gap:14px;flex-wrap:wrap;font-size:.95rem}
.nav a{opacity:.92}
main{padding:24px 0 64px}
footer.site{background:var(--bg);color:#94a3b8;padding:28px 0;font-size:.9rem}
footer.site a{color:#cbd5e1}

/* hero */
.hero{background:linear-gradient(120deg,#1e3a8a,#6d28d9);color:#fff;border-radius:var(--radius);
  padding:40px 28px;margin:8px 0 24px}
.hero h1{margin:.1em 0;font-size:2rem;letter-spacing:-.02em}
.hero p{font-size:1.1rem;opacity:.95;max-width:60ch}
.btn{display:inline-block;background:#fff;color:var(--brand);font-weight:700;
  padding:12px 20px;border-radius:999px;border:0;cursor:pointer;font-size:1rem}
.btn:hover{text-decoration:none;filter:brightness(.97)}
.btn.ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.6)}
.btn.block{display:block;width:100%;text-align:center}

/* cards / catalog */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;margin:14px 0;box-shadow:0 1px 2px rgba(15,23,42,.04)}
.grid{display:grid;gap:14px;grid-template-columns:1fr}
@media(min-width:640px){.grid.two{grid-template-columns:1fr 1fr}}
.sec-title{font-size:1.05rem;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;
  font-weight:700;margin:24px 0 8px}
.subsec-title{font-size:.9rem;color:var(--ink);font-weight:700;margin:14px 0 4px 4px;
  padding-left:8px;border-left:3px solid var(--ring)}
.cookiebar{position:fixed;left:12px;right:12px;bottom:12px;max-width:760px;margin:0 auto;
  background:#0f172a;color:#e2e8f0;padding:12px 16px;border-radius:12px;
  box-shadow:0 6px 24px rgba(0,0,0,.25);font-size:.9rem;display:flex;gap:12px;
  align-items:center;flex-wrap:wrap;z-index:50}
.cookiebar a{color:#93c5fd}
.cookiebar .btn{margin-left:auto;padding:8px 14px}
.cookiebar.hidden{display:none}
.searchbox{position:relative;margin:18px 0}
.searchbox input{width:100%;box-sizing:border-box;padding:14px 16px;font-size:1.05rem;
  border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink)}
.searchbox input:focus{outline:none;border-color:var(--ring);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
.searchresults{position:absolute;left:0;right:0;top:calc(100% + 6px);background:#fff;
  border:1px solid var(--line);border-radius:12px;box-shadow:0 8px 28px rgba(15,23,42,.12);
  max-height:60vh;overflow:auto;z-index:40}
.searchresults[hidden]{display:none}
.sr-item{display:flex;flex-direction:column;gap:2px;padding:10px 14px;border-bottom:1px solid var(--soft)}
.sr-item:last-child{border-bottom:0}
.sr-item:hover{background:var(--soft);text-decoration:none}
.sr-title{font-weight:700;color:var(--ink)}
.sr-meta{font-size:.85rem;color:var(--muted)}
.sr-empty{padding:12px 14px;color:var(--muted)}
.topic-link{display:flex;align-items:center;gap:12px;padding:14px 16px;background:#fff;
  border:1px solid var(--line);border-radius:12px;margin:8px 0;font-weight:600;color:var(--ink)}
.topic-link:hover{border-color:var(--ring);text-decoration:none;box-shadow:0 2px 8px rgba(37,99,235,.08)}
.topic-link .chip{margin-left:auto}

/* status chips */
.chip{font-size:.8rem;font-weight:700;padding:3px 10px;border-radius:999px;white-space:nowrap}
.chip.nezacate{background:#e2e8f0;color:#475569}
.chip.rozpracovane{background:#fef3c7;color:#92400e}
.chip.zvladnute{background:#dcfce7;color:#166534}
.chip.majster{background:#ede9fe;color:#5b21b6}

/* topic content */
.crumbs{font-size:.85rem;color:var(--muted);margin:4px 0 12px}
h1.topic{font-size:1.8rem;letter-spacing:-.02em;margin:.2em 0}
.content h2{font-size:1.3rem;margin:1.4em 0 .4em;padding-top:.3em}
.content h3,.content h4{font-size:1.05rem;margin:1.1em 0 .3em;color:#334155}
.content ul{padding-left:1.2em}
.content blockquote{margin:.8em 0;padding:.6em 1em;background:var(--soft);
  border-left:4px solid var(--brand);border-radius:0 8px 8px 0;color:#334155}
.content code{background:#eef2ff;padding:.1em .35em;border-radius:6px;font-size:.92em}
.content table{border-collapse:collapse;width:100%;margin:.6em 0}
.content th,.content td{border:1px solid var(--line);padding:6px 10px;text-align:left}
.content th{background:var(--soft)}

/* steps */
.steps{display:flex;gap:6px;flex-wrap:wrap;margin:8px 0 18px}
.step-pill{font-size:.78rem;padding:4px 10px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--muted)}
.step-pill.active{background:var(--brand);color:#fff;border-color:var(--brand)}

/* quiz */
.quiz .q{margin:16px 0;padding:16px;border:1px solid var(--line);border-radius:12px;background:#fff}
.quiz .q .prompt{font-weight:700;margin-bottom:8px}
.quiz .opt{display:block;width:100%;text-align:left;padding:11px 14px;margin:7px 0;border:1.5px solid var(--line);
  border-radius:10px;background:#fff;cursor:pointer;font-size:1rem;color:var(--ink);transition:.12s}
.quiz .opt:hover{border-color:var(--ring)}
.quiz .opt:disabled{cursor:default;opacity:1}
.quiz .opt.correct{border-color:var(--ok);background:#dcfce7;font-weight:600}
.quiz .opt.wrong{border-color:var(--bad);background:#fee2e2}
.quiz .why{margin-top:8px;font-size:.92rem;color:#334155;background:var(--soft);padding:8px 12px;border-radius:8px;display:none}
.quiz .why.show{display:block}

/* evaluation */
.eval{border-radius:var(--radius);padding:20px;margin:18px 0;background:linear-gradient(120deg,#ecfdf5,#eff6ff);border:1px solid #bbf7d0}
.eval h3{margin:.1em 0}
.score{font-size:2.2rem;font-weight:800;color:var(--ok)}
.bar{height:12px;background:#e2e8f0;border-radius:999px;overflow:hidden;margin:8px 0}
.bar>span{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--ok))}
.pills{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0}
.pill{font-size:.82rem;padding:4px 10px;border-radius:999px;background:#fff;border:1px solid var(--line)}
.pill.good{border-color:#bbf7d0;background:#f0fdf4;color:#166534}
.pill.weak{border-color:#fecaca;background:#fef2f2;color:#991b1b}

/* dashboard */
.stat{display:flex;align-items:baseline;gap:8px}
.stat .n{font-size:1.8rem;font-weight:800;color:var(--brand)}
.badges{display:flex;gap:10px;flex-wrap:wrap}
.badge{display:flex;flex-direction:column;align-items:center;gap:2px;width:84px;text-align:center;
  padding:10px;border:1px solid var(--line);border-radius:12px;background:#fff;font-size:.75rem}
.badge.locked{opacity:.4;filter:grayscale(1)}
.badge .ico{font-size:1.6rem}

.note{font-size:.85rem;color:var(--muted)}
.hidden{display:none!important}
.toast{position:fixed;left:50%;bottom:20px;transform:translateX(-50%);background:var(--ink);color:#fff;
  padding:10px 18px;border-radius:999px;font-weight:600;box-shadow:0 6px 20px rgba(0,0,0,.25);z-index:50;opacity:0;transition:.3s}
.toast.show{opacity:1}

/* AI chat widget */
.chatfab{position:fixed;right:16px;bottom:16px;z-index:60;background:var(--brand);color:#fff;border:0;
  border-radius:999px;padding:12px 18px;font-weight:700;font-size:1rem;cursor:pointer;box-shadow:0 6px 20px rgba(37,99,235,.4)}
.chatpanel{position:fixed;right:16px;bottom:74px;z-index:60;width:min(360px,calc(100vw - 32px));height:460px;
  background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 12px 40px rgba(15,23,42,.25);display:flex;flex-direction:column;overflow:hidden}
.chathead{background:var(--brand);color:#fff;padding:12px 16px;font-weight:700}
.chathead #chatx{float:right;cursor:pointer}
.chatlog{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:8px;background:var(--soft)}
.chatlog .msg{padding:9px 12px;border-radius:12px;max-width:85%;font-size:.95rem;white-space:pre-wrap}
.chatlog .msg.user{align-self:flex-end;background:var(--brand);color:#fff;border-bottom-right-radius:3px}
.chatlog .msg.ai{align-self:flex-start;background:#fff;border:1px solid var(--line);border-bottom-left-radius:3px}
#chatf{display:flex;gap:6px;padding:10px;border-top:1px solid var(--line)}
#chatf input{flex:1;padding:10px;border:1px solid var(--line);border-radius:10px;font-size:1rem}
#chatf .btn{padding:10px 16px}

/* formuláre */
.field{display:block;margin:10px 0}
.field input{width:100%;padding:10px;border:1px solid #cbd5e1;border-radius:8px;font-size:1rem}

/* ročníkový selektor */
.gradegrid{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0}
.gradebtn{min-width:120px;text-align:center}
.btn.disabled{background:#e2e8f0;color:#94a3b8;cursor:not-allowed;pointer-events:none}