:root{
  --bg:#0b0d12;--surface:#12151c;--surface-2:#181c26;--line:#222836;
  --text:#e7e9ee;--muted:#8a91a3;--accent:#f2b84b;--accent-ink:#1a1405;
  --err:#ff7b7b;--ok:#5ad39a;--radius:14px;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);
  font:16px/1.55 Tahoma,Verdana,"DejaVu Sans",Geneva,sans-serif;
  -webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

/* Kopfzeile */
header{position:sticky;top:0;z-index:10;display:flex;flex-wrap:wrap;align-items:center;gap:.4rem 1.6rem;
  padding:.75rem 1.4rem;background:rgba(11,13,18,.85);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:.6rem;color:var(--text);font-weight:650;letter-spacing:.2px}
.brand:hover{text-decoration:none}
.brand img{width:30px;height:30px;display:block}
nav{display:flex;flex-wrap:wrap;align-items:center;gap:.2rem 1.2rem;flex:1}
nav a{color:var(--muted);padding:.25rem 0;font-size:.95rem}
nav a:hover{color:var(--text);text-decoration:none}
nav form{margin:0 0 0 auto}

main{max-width:960px;margin:0 auto;padding:2rem 1.4rem 4rem}
h1{font-size:1.7rem;font-weight:650;letter-spacing:-.01em;margin:.2rem 0 1.2rem}
h2{font-size:1.05rem;font-weight:600;margin:0 0 .8rem;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.muted{color:var(--muted)}
.badge{font-size:.9rem;font-weight:400;color:var(--muted);margin-left:.4rem}

/* Flächen */
.card,.tile{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.card{padding:1.3rem;margin-bottom:1rem}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem}
.tile{display:block;padding:1.5rem;color:var(--text);transition:border-color .15s,transform .15s}
.tile:hover{border-color:var(--accent);text-decoration:none;transform:translateY(-2px)}
.tile b{display:block;font-size:1.15rem;margin-bottom:.15rem}

/* Formulare */
label{display:block;margin:1rem 0 .3rem;font-size:.9rem;color:var(--muted)}
input[type=text],input[type=password],input[type=date],input[type=file],textarea,select{
  width:100%;padding:.7rem .85rem;font:inherit;color:var(--text);
  background:var(--bg);border:1px solid var(--line);border-radius:10px;outline:none;
  transition:border-color .15s,box-shadow .15s}
input:focus,textarea:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(242,184,75,.15)}
input[type=file]{padding:.55rem}
textarea{min-height:16rem;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.88rem}
textarea.names{min-height:8rem;font-family:inherit;font-size:1rem}

/* Buttons */
button,.btn{display:inline-block;padding:.65rem 1.1rem;font:inherit;font-weight:600;color:var(--accent-ink);
  background:var(--accent);border:1px solid var(--accent);border-radius:10px;cursor:pointer;transition:filter .15s}
button:hover,.btn:hover{filter:brightness(1.08);text-decoration:none}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--muted);filter:none}
.btn-danger{background:transparent;color:var(--err);border-color:rgba(255,123,123,.35)}
.btn-danger:hover{background:rgba(255,123,123,.1);filter:none}
.btn-sm{padding:.3rem .7rem;font-size:.88rem;font-weight:500}

/* Meldungen */
.flash{padding:.75rem 1rem;border-radius:10px;margin-bottom:1rem;border:1px solid transparent}
.flash.error{background:rgba(255,123,123,.1);border-color:rgba(255,123,123,.3);color:var(--err)}
.flash.ok{background:rgba(90,211,154,.1);border-color:rgba(90,211,154,.3);color:var(--ok)}

/* Tabellen & Listen */
table{width:100%;border-collapse:collapse}
th{font-size:.8rem;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}
th,td{text-align:left;padding:.7rem .5rem;border-bottom:1px solid var(--line);vertical-align:middle}
tr:last-child td{border-bottom:0}
td form{display:inline}
.list a{display:block;padding:.75rem 0;border-bottom:1px solid var(--line);color:var(--text)}
.list a:last-child{border-bottom:0}
.list a:hover{color:var(--accent);text-decoration:none}

/* Karteikarten */
iframe.cardframe{width:100%;height:75vh;border:1px solid var(--line);border-radius:var(--radius);background:#fff}

/* Login */
.auth{max-width:400px;margin:4vh auto 0}
.auth .logo{display:block;width:84px;height:84px;margin:0 auto 1rem}
.auth h1{text-align:center;margin-bottom:1.2rem}
.auth .sub{text-align:center;color:var(--muted);margin:0 0 1.2rem}
.auth button{width:100%;margin-top:1.3rem}

.mono,code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.cred td{font-size:1.05rem}
.err-page{text-align:center;padding-top:10vh}
.err-page .code{font-size:4rem;font-weight:700;color:var(--accent);line-height:1}

@media (max-width:600px){
  main{padding:1.2rem 1rem 3rem}
  header{padding:.7rem 1rem}
}
@media print{
  body{background:#fff;color:#000}
  header,.noprint{display:none}
  .card{background:#fff;border-color:#ccc}
  th,td{border-color:#ccc;color:#000}
  .flash{display:none}
}
.center{text-align:center}

/* Hinweisbox, Unternavigation, Aufgaben */
.notice{border:1px solid var(--line);border-left:3px solid var(--accent);background:var(--surface);
  border-radius:10px;padding:.75rem 1rem;color:var(--muted);font-size:.92rem;margin:0 0 1.2rem}
.notice strong{color:var(--text)}
.subnav{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:1.4rem}
.subnav a{padding:.3rem .85rem;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:.92rem}
.subnav a:hover{color:var(--text);text-decoration:none;border-color:var(--muted)}
.subnav a.active{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);font-weight:600}
.prewrap{white-space:pre-wrap;overflow-wrap:anywhere}
textarea.plain{min-height:12rem;font-family:inherit;font-size:1rem}
input[type=checkbox]{width:auto;margin-right:.5rem}
input[type=date]{color-scheme:dark}

/* Notenrechner */
.row2{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
@media (max-width:520px){.row2{grid-template-columns:1fr}}
.result{display:flex;align-items:center;gap:1.1rem;margin-top:1rem;padding:1rem 1.2rem;
  border:1px solid var(--line);border-radius:12px;background:var(--bg)}
.grade{font-size:2.6rem;font-weight:700;color:var(--accent);line-height:1;min-width:2.2rem;text-align:center}
select{color-scheme:dark}
input[type=radio]{width:auto;margin-right:.5rem}
label:has(input[type=radio]),label:has(input[type=checkbox]){display:block;margin:.35rem 0}
.ok{color:#7fd48a}
h3{font-size:.95rem;margin:1rem 0 .3rem;color:var(--muted,#9aa)}