:root{
  --bg:#f5f6f8; --card:#fff; --ink:#1b2430; --muted:#5d6b7a; --line:#dde2e8;
  --brand:#123f73; --brand-2:#1f63b0; --accent:#e8f0fb;
  --t:#2c5aa0; --lt:#0f7b6c; --ip:#b4541a; --st:#7a3fa0; --warn:#a33a1f;
  --radius:12px;
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#11151b; --card:#1a2028; --ink:#e6ebf1; --muted:#9aa7b5; --line:#2a323d;
         --brand:#8fb4ec; --brand-2:#a9c6f1; --accent:#1e2a3a;
         --t:#8fb4ec; --lt:#5cc7b5; --ip:#f0a06a; --st:#c79be6; --warn:#f08a70; }
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);
  font:16px/1.45 system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans",sans-serif}
a{color:var(--brand-2)}
header.top{background:#1f3b6b;color:#fff;padding:14px 16px}
header.top .wrap{display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap}
header.top h1{font-size:1.15rem;margin:0;font-weight:650;letter-spacing:.2px}
header.top small{opacity:.8;display:block;font-size:.8rem}
header.top a{color:#fff;text-decoration:none}
.wrap{max-width:1100px;margin:0 auto}
main{padding:16px}
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:4px 0 14px}
.tab{border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:999px;
  padding:8px 16px;font-size:1rem;cursor:pointer;font-weight:600}
.tab[aria-pressed="true"]{background:var(--brand);color:#fff;border-color:var(--brand)}
@media (prefers-color-scheme: dark){ .tab[aria-pressed="true"]{color:#11151b} }
.toolbar{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:14px}
.toolbar select,.toolbar input{font:inherit;padding:8px 10px;border:1px solid var(--line);
  border-radius:8px;background:var(--card);color:var(--ink);min-width:0}
.toolbar input{flex:1 1 200px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);margin-bottom:12px;overflow:hidden}
.card h2{font-size:1rem;margin:0;padding:12px 14px;border-bottom:1px solid var(--line);
  display:flex;justify-content:space-between;gap:8px;align-items:baseline}
.card h2 span{color:var(--muted);font-weight:500;font-size:.85rem}
.today h2{background:var(--accent)}
ul.hours{list-style:none;margin:0;padding:0}
ul.hours li a{display:grid;grid-template-columns:118px 64px 1fr auto;gap:10px;align-items:center;
  padding:10px 14px;border-top:1px solid var(--line);color:var(--ink);text-decoration:none}
ul.hours li:first-child a{border-top:0}
ul.hours li a:hover{background:var(--accent)}
.when{color:var(--muted);font-size:.9rem;font-variant-numeric:tabular-nums}
.badge{font-size:.75rem;font-weight:700;border-radius:6px;padding:2px 7px;text-align:center;
  border:1.5px solid currentColor;white-space:nowrap}
.b-t{color:var(--t)} .b-lt{color:var(--lt)} .b-ip{color:var(--ip)} .b-stagiu,.b-caip{color:var(--st)}
.ttl{min-width:0}
.ttl b{font-weight:600}
.ttl small{display:block;color:var(--muted);font-size:.8rem}
.ev{font-size:.75rem;color:var(--warn);font-weight:700;white-space:nowrap}
details.week{border-top:1px solid var(--line)}
details.week summary{padding:10px 14px;cursor:pointer;font-weight:600;list-style-position:inside}
details.week[open] summary{background:var(--accent)}
.empty{padding:14px;color:var(--muted)}
@media (max-width:640px){
  ul.hours li a{grid-template-columns:1fr auto;grid-template-areas:"when badge" "ttl ttl" "ev ev";gap:4px 8px}
  .when{grid-area:when} .badge{grid-area:badge;justify-self:end} .ttl{grid-area:ttl} .ev{grid-area:ev}
}

/* pagina orei */
.lesson-head{background:var(--card);border-bottom:1px solid var(--line);padding:14px 16px;position:sticky;top:0;z-index:5}
.lesson-head .meta{color:var(--muted);font-size:.9rem;margin-bottom:4px}
.lesson-head h2{margin:0 0 10px;font-size:1.2rem;line-height:1.3}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.btn{font:inherit;font-weight:600;display:inline-flex;align-items:center;gap:6px;cursor:pointer;
  padding:10px 16px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--ink);
  text-decoration:none;min-height:44px}
.btn.primary{background:#1f3b6b;border-color:#1f3b6b;color:#fff}
.btn.lock{border-color:var(--warn);color:var(--warn)}
.btn:hover{filter:brightness(1.06)}
.btn[hidden]{display:none}
.nav{display:flex;justify-content:space-between;gap:8px;padding:10px 16px;flex-wrap:wrap}
.parts{padding:0 16px;color:var(--muted);font-size:.85rem}
.parts li{margin:2px 0}
#viewer{padding:12px 8px 40px;display:flex;flex-direction:column;align-items:center;gap:12px}
#viewer canvas{background:#fff;box-shadow:0 1px 6px rgba(0,0,0,.18);max-width:100%;height:auto}
.status{padding:24px;color:var(--muted);text-align:center}
.pw{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;
  max-width:420px;margin:24px auto;display:flex;flex-direction:column;gap:10px}
.pw input{font:inherit;padding:10px;border-radius:8px;border:1px solid var(--line);background:var(--bg);color:var(--ink)}
body.board{font-size:19px}
body.board #viewer canvas{max-width:100%}
@media print{ .lesson-head,.nav,.parts,header.top{display:none} }
.b-l{color:var(--lt)} .b-p{color:var(--ip)}
.nr{font-size:.75rem;color:var(--muted);font-weight:700;white-space:nowrap}
.extra{margin:8px 0 0;padding:0;list-style:none;display:flex;gap:8px;flex-wrap:wrap}
.tabs{flex-wrap:wrap}