:root{
  --bg:#0b1220; --bg2:#0e1728; --card:#131f36; --card2:#182747;
  --line:#25324e; --ink:#eaf1ff; --mut:#8fa2c4; --dim:#5f7196;
  --blue:#3aa0ff; --cyan:#39d0e6; --cyan2:#5be6ff; --violet:#7c6cff;
  --ok:#33d69f; --warn:#ffbf4d; --bad:#ff6b6b; --xp:#39d0e6;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
body{margin:0;color:var(--ink);
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;line-height:1.55;
  background:
    radial-gradient(900px 500px at 8% -8%, rgba(58,160,255,.18), transparent 60%),
    radial-gradient(820px 480px at 100% 0%, rgba(124,108,255,.16), transparent 55%),
    var(--bg);
  min-height:100vh;}
a{color:var(--cyan2)}
.top{display:flex;justify-content:space-between;align-items:center;padding:12px 20px;
  border-bottom:1px solid var(--line);background:rgba(11,18,32,.7);backdrop-filter:blur(8px);
  position:sticky;top:0;z-index:9}
.brand{font-weight:900;font-size:19px;letter-spacing:.3px;text-decoration:none;color:var(--ink);
  display:inline-flex;align-items:center;gap:9px}
.brand .logo{flex:none;display:block;filter:drop-shadow(0 0 6px rgba(91,230,255,.25))}
.brand .bname span{background:linear-gradient(90deg,var(--cyan2),var(--violet));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.topright{display:flex;align-items:center;gap:12px;font-size:14px}
.uname{font-weight:700}
.navlink{color:var(--mut);text-decoration:none;font-weight:600}
.navlink:hover{color:var(--cyan2)}

/* ---- Level-Emblem ---- */
.emblem{--e:#888;display:grid;place-items:center;width:34px;height:34px;border-radius:9px;
  background:radial-gradient(circle at 30% 25%, #ffffff55, transparent 55%), var(--e);
  color:#08101f;font-weight:900;box-shadow:0 0 0 1px #ffffff22, 0 4px 12px #0007;
  clip-path:polygon(50% 0,93% 25%,93% 75%,50% 100%,7% 75%,7% 25%)}
.emblem .lvlnum{font-size:15px}
.emblem.big{width:58px;height:58px;flex:none}
.emblem.big .lvlnum{font-size:22px}
.emblem.big small{display:none}

/* ---- HUD (Level/XP/Streak) ---- */
.hud{display:flex;align-items:center;gap:14px;max-width:720px;margin:16px auto 0;
  padding:14px 16px;border:1px solid var(--line);border-radius:16px;
  background:linear-gradient(180deg,var(--card),var(--card2));box-shadow:0 12px 30px #0006}
.xpwrap{flex:1;min-width:0}
.xptop{display:flex;justify-content:space-between;font-size:12px;color:var(--mut);margin-bottom:6px}
.xptop b{color:var(--xp)} .xptop .max{color:var(--cyan2);font-weight:800}
.xpbar{height:14px;border-radius:99px;background:#0a1424;
  border:1px solid var(--line);overflow:hidden}
.xpfill{height:100%;border-radius:99px;transition:width .5s ease;
  background:linear-gradient(90deg,var(--cyan),var(--blue))}
.streak{text-align:center;min-width:52px}
.streak .flame{font-size:22px;filter:grayscale(1) opacity(.5)}
.streak.hot .flame{filter:none;text-shadow:0 0 12px #ff8a3caa}
.streak .sn{font-weight:900;font-size:16px}
.streak small{font-size:10px;color:var(--mut);display:block}

.pbanner{max-width:720px;margin:12px auto 0;padding:9px 16px;border-radius:10px;
  background:rgba(124,108,255,.15);border:1px solid rgba(124,108,255,.4);color:#c9c2ff;
  font-weight:600;font-size:14px;text-align:center}
.toast{max-width:720px;margin:12px auto 0;padding:11px 16px;border-radius:12px;text-align:center;
  font-weight:800;background:linear-gradient(90deg,rgba(57,208,230,.16),rgba(124,108,255,.16));
  border:1px solid var(--line);color:var(--xp)}
.toast .up{color:var(--cyan2)}
.flash{max-width:720px;margin:12px auto 0;padding:10px 16px;border-radius:10px;font-weight:600;
  background:rgba(255,191,77,.12);border:1px solid rgba(255,191,77,.35);color:var(--warn)}

.wrap{max-width:720px;margin:0 auto;padding:20px}
.card{background:linear-gradient(180deg,var(--card),var(--card2));border:1px solid var(--line);
  border-radius:16px;padding:22px 24px;margin-bottom:16px;box-shadow:0 10px 30px #0005}
.card.hero{margin-top:40px}
h1{font-size:25px;margin:0 0 12px}
h2{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--mut);margin:6px 0 12px}
.grad{background:linear-gradient(90deg,var(--cyan2),var(--violet));-webkit-background-clip:text;
  background-clip:text;-webkit-text-fill-color:transparent}
.q{font-size:20px;line-height:1.5;margin:8px 0 18px;white-space:pre-wrap}
.mut{color:var(--mut)} .small{font-size:13px} .tname{font-weight:800;margin:0 0 10px}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
.tag{font-family:var(--mono);font-size:12px;background:#0e1a30;border:1px solid var(--line);
  border-radius:6px;padding:3px 8px;color:var(--mut)}

.btn{display:inline-block;width:100%;border:none;cursor:pointer;font-size:16px;font-weight:800;
  padding:14px;border-radius:12px;color:#06101f;margin-top:8px;
  background:linear-gradient(135deg,var(--cyan2),var(--blue));box-shadow:0 8px 20px rgba(58,160,255,.3)}
.btn:hover{filter:brightness(1.06)} .btn:active{transform:translateY(1px)}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--ink);box-shadow:none;width:auto;padding:11px 16px}
.btn.danger{background:linear-gradient(135deg,#ff7a7a,#e0344f);color:#fff}
.btn.small{width:auto;padding:9px 14px;font-size:14px}
.choice{display:block;width:100%;text-align:left;padding:14px 16px;margin:8px 0;border-radius:12px;
  background:#0f1c34;border:1px solid var(--line);color:var(--ink);font-size:16px;cursor:pointer}
.choice:hover{border-color:var(--cyan2);background:#12213c}
.row{display:flex;gap:10px;flex-wrap:wrap}.row form{flex:1}.row .btn{margin-top:0}
input[type=text],input[type=number]{width:100%;padding:12px 14px;border-radius:11px;
  border:1px solid var(--line);background:#0d1628;color:var(--ink);font-size:16px}
input[type=range]{width:100%;margin:14px 0 4px;accent-color:var(--cyan)}
.bignum{text-align:center;font-size:30px;font-weight:900;color:var(--cyan2)}
.link{display:inline-block;margin-top:10px;color:var(--cyan2);text-decoration:none;font-weight:700}

/* ---- Overview ---- */
.stats{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.stat{background:#0e1a30;border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.stat .k{display:block;font-size:12px;color:var(--mut);margin-bottom:4px}
.stat .val{font-size:22px;font-weight:800;font-variant-numeric:tabular-nums}
.actions{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px;margin-bottom:16px}
.tile{display:flex;flex-direction:column;gap:6px;padding:20px;border-radius:16px;text-decoration:none;
  color:var(--ink);background:linear-gradient(180deg,var(--card),var(--card2));border:1px solid var(--line);
  box-shadow:0 10px 26px #0005;transition:transform .08s,border-color .15s}
.tile:hover{transform:translateY(-2px);border-color:var(--cyan)}
.tile.primary{background:linear-gradient(150deg,#123a63,#0e1728);border-color:#2b6aa0}
.tile.disabled{opacity:.5;pointer-events:none}
.tile .ti{font-size:24px}.tile .tt{font-weight:800;font-size:17px}.tile .td{font-size:13px;color:var(--mut)}
.picklist{display:flex;flex-direction:column;gap:10px}
.pick{display:flex;justify-content:space-between;align-items:center;padding:14px 16px;border-radius:12px;
  text-decoration:none;color:var(--ink);background:#0f1c34;border:1px solid var(--line)}
.pick:hover{border-color:var(--cyan2)}.pick .tt{font-weight:700}

/* ---- Dev / Tabellen ---- */
.grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;max-width:720px;margin:0 auto;padding:0 20px}
.grid .card{margin:0}
.stack{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}
.stack label{font-size:13px;color:var(--mut);font-weight:600}
.devh{max-width:720px;margin:20px auto 0;padding:0 20px}
pre{background:#070d18;color:#cdd9ee;font-family:var(--mono);font-size:12px;line-height:1.5;
  padding:14px;border-radius:10px;overflow:auto;max-height:280px;border:1px solid var(--line)}
.scroll{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:13px;font-variant-numeric:tabular-nums}
th,td{padding:7px 9px;border-bottom:1px solid var(--line);text-align:left;white-space:nowrap}
th{color:var(--mut);font-weight:700}
@media(max-width:680px){.actions,.stats,.grid{grid-template-columns:1fr}}

/* Rechenbeispiel in der Erklaerung -- abgesetzte Box, damit Text und Rechnung
   nicht ineinanderlaufen. Hervorhebungen in der Akzentfarbe der Oberflaeche. */
.exbox{margin:14px 0 4px;border:1px solid var(--line);border-left:3px solid var(--cyan2);
  border-radius:10px;background:var(--card2);overflow:hidden}
.exhead{font-size:11px;letter-spacing:.10em;text-transform:uppercase;color:var(--mut);
  padding:8px 14px 0}
.exbody{margin:0;padding:6px 14px 12px;font-family:var(--mono);font-size:14.5px;
  line-height:1.65;white-space:pre-wrap;overflow-x:auto;color:var(--ink)}
.exbody .hl{color:var(--cyan2);font-weight:700;background:rgba(91,230,255,.10);
  border-radius:4px;padding:0 3px}