/* Lernwerk — gemeinsames Stylesheet.
   Ein Farbton kommt pro Schule aus dem Branding (--brand), alles andere
   ist neutral, damit White-Label nicht nach Fremdprodukt aussieht. */
:root{
  --brand:#1d4ed8; --accent:#f5b800;
  --bg:#f6f7f9; --panel:#fff; --ink:#12151b; --muted:#5b6472; --line:#e2e6ec;
  --ok:#12a05c; --bad:#d92d20; --radius:12px;
  --fs-bg:#fff; --fs-grid:#c9ced8;
  font-synthesis-weight:none;
}
@media (prefers-color-scheme:dark){
  :root{ --bg:#0e1116; --panel:#161a21; --ink:#e8ecf2; --muted:#98a2b3; --line:#252b35;
         --fs-bg:#1b202a; --fs-grid:#39414f; }
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font:15px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,sans-serif;
  background:var(--bg); color:var(--ink); -webkit-font-smoothing:antialiased;
}
a{color:var(--brand);text-decoration:none} a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.2;margin:0 0 .5em}
h1{font-size:22px;font-weight:650} h2{font-size:17px;font-weight:640} h3{font-size:14px;font-weight:640}
.muted{color:var(--muted)} .small{font-size:13px} .tiny{font-size:12px}
.row{display:flex;gap:10px;align-items:center} .row.wrap{flex-wrap:wrap}
.spacer{flex:1} .stack{display:flex;flex-direction:column;gap:10px}

/* Kopfzeile */
header.top{
  display:flex;align-items:center;gap:14px;padding:10px 16px;
  background:var(--panel);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20
}
.brand{display:flex;align-items:center;gap:9px;font-weight:680}
.brand .dot{width:22px;height:22px;border-radius:6px;background:var(--brand);display:grid;place-items:center;color:#fff;font-size:12px}
nav.tabs{display:flex;gap:2px}
nav.tabs button{
  background:none;border:0;padding:7px 12px;border-radius:8px;color:var(--muted);
  font:inherit;font-weight:560;cursor:pointer
}
nav.tabs button.on{background:color-mix(in srgb,var(--brand) 12%,transparent);color:var(--brand)}

main{max-width:1180px;margin:0 auto;padding:18px 16px 60px}
.wide{max-width:none}

.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:14px}
.card + .card{margin-top:12px}
.grid{display:grid;gap:12px}
.grid.two{grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}
.grid.three{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}

button,.btn{
  font:inherit;font-weight:600;padding:8px 14px;border-radius:9px;border:1px solid var(--line);
  background:var(--panel);color:var(--ink);cursor:pointer
}
button:hover,.btn:hover{border-color:var(--brand)}
button.primary,.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
button.ghost{border-color:transparent;background:transparent;color:var(--muted)}
button.danger{color:var(--bad);border-color:color-mix(in srgb,var(--bad) 40%,var(--line))}
button:disabled{opacity:.5;cursor:not-allowed}
button.sm{padding:5px 10px;font-size:13px}

input,textarea,select{
  font:inherit;width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:9px;
  background:var(--bg);color:var(--ink)
}
input:focus,textarea:focus,select:focus{outline:2px solid color-mix(in srgb,var(--brand) 45%,transparent);outline-offset:-1px}
label{display:block;font-size:13px;font-weight:600;color:var(--muted);margin:0 0 4px}
textarea{min-height:90px;resize:vertical;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px}

table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line)}
th{font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);font-weight:640}
tr.click{cursor:pointer} tr.click:hover td{background:color-mix(in srgb,var(--brand) 6%,transparent)}

.pill{display:inline-block;padding:2px 8px;border-radius:999px;font-size:12px;font-weight:600;
  background:color-mix(in srgb,var(--brand) 12%,transparent);color:var(--brand)}
.pill.ok{background:color-mix(in srgb,var(--ok) 15%,transparent);color:var(--ok)}
.pill.bad{background:color-mix(in srgb,var(--bad) 14%,transparent);color:var(--bad)}
.pill.grey{background:color-mix(in srgb,var(--muted) 14%,transparent);color:var(--muted)}

.toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%);background:var(--ink);color:var(--bg);
  padding:9px 16px;border-radius:999px;font-size:14px;font-weight:600;z-index:99;opacity:0;transition:opacity .18s}
.toast.on{opacity:1}

/* Aufgaben-Darstellung */
.fs-matrix{width:100%;height:auto;display:block;border-radius:6px}
.seq{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.seq .m{width:120px}
.seq .q{width:120px;height:120px;display:grid;place-items:center;border:2px dashed var(--line);
  border-radius:8px;font-size:30px;color:var(--muted)}
.opts{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:12px}
.opt{border:2px solid var(--line);border-radius:10px;padding:5px;cursor:pointer;background:var(--panel)}
.opt:hover{border-color:var(--brand)}
.opt.sel{border-color:var(--brand)}
.opt.right{border-color:var(--ok);box-shadow:0 0 0 3px color-mix(in srgb,var(--ok) 20%,transparent)}
.opt.wrong{border-color:var(--bad);box-shadow:0 0 0 3px color-mix(in srgb,var(--bad) 18%,transparent)}
.opt .k{font-size:12px;font-weight:700;color:var(--muted);text-align:center}
@media(max-width:640px){ .opts{grid-template-columns:repeat(3,1fr)} .seq .m,.seq .q{width:88px;height:auto} }