@import url('https://fonts.googleapis.com/css2?family=Baloo+2:wght@500;700&family=Bowlby+One&display=swap');
:root{--gelb:#ffd60a;--gold:#ffb800;--schnabel:#ff6b00;--teich:#0a8fd6;--tief:#064c7a;--schaum:#e8f8ff;--tinte:#2a1800}
*{box-sizing:border-box}
body{margin:0;font:500 18px/1.5 'Baloo 2','Trebuchet MS',sans-serif;color:var(--tinte);
 background-color:var(--gelb);
 background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Ctext x='8' y='48' font-size='40' opacity='.35'%3E🦆%3C/text%3E%3Ctext x='66' y='106' font-size='34' opacity='.25' transform='rotate(-14 80 90)'%3E🐥%3C/text%3E%3C/svg%3E")}
.marquee{background:var(--tief);color:#fff;overflow:hidden;white-space:nowrap;border-bottom:4px dashed var(--gold);font-weight:700}
.marquee span{display:inline-block;padding:.3em 0;padding-left:100%;animation:scroll 28s linear infinite}
@keyframes scroll{to{transform:translateX(-100%)}}
.top{text-align:center;padding:1.2rem 1rem .6rem;background:linear-gradient(#fff3a0,transparent)}
.logo{display:inline-flex;align-items:center;gap:.25em;text-decoration:none;color:var(--tinte);
 font:400 clamp(1.6rem,6vw,3.4rem)/1 'Bowlby One','Arial Black',sans-serif;
 text-shadow:3px 3px 0 var(--gold),6px 6px 0 var(--schnabel);position:relative}
.logo .duck{font-size:1.5em;display:inline-block;animation:wackel 2.4s ease-in-out infinite}
.logo .crown{position:absolute;left:-.1em;top:-.85em;font-size:.9em;transform:rotate(-18deg)}
.logo small{font-size:.55em}.logo em{font-style:normal;color:var(--schnabel)}
.shades{font-size:.8em;margin-left:.1em}
@keyframes wackel{0%,100%{transform:rotate(-8deg)}50%{transform:rotate(8deg) translateY(-6px)}}
.claim{margin:.5rem 0 0;font-weight:700;color:var(--tief);font-size:1.1rem;transform:rotate(-1deg)}
.tabs{display:flex;flex-wrap:wrap;gap:.5rem;justify-content:center;padding:.8rem;max-width:1100px;margin:0 auto}
.tabs a{background:#fff;color:var(--tief);text-decoration:none;font-weight:700;padding:.45em 1em;border:3px solid var(--tinte);
 border-radius:2em 2em 2em .4em;box-shadow:4px 4px 0 var(--tinte);transition:transform .15s}
.tabs a:hover{transform:translate(-2px,-3px) rotate(-2deg)}
.tabs a.on{background:var(--schnabel);color:#fff;box-shadow:4px 4px 0 var(--tief)}
.tabs a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:4px solid var(--teich);outline-offset:2px}
.wrap{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:1.5rem;max-width:1100px;margin:0 auto;padding:0 1rem 2rem}
h1{font:400 clamp(1.7rem,4.5vw,2.6rem)/1.1 'Bowlby One','Arial Black',sans-serif;margin:.4em 0 .1em;color:var(--tief);text-shadow:2px 2px 0 #fff}
h2,h3{font-family:'Bowlby One','Arial Black',sans-serif;font-weight:400;margin:.1em 0 .5em}
.sub{margin:0 0 1rem;font-weight:700}
.card{background:#fffbe0;border:4px solid var(--tinte);border-radius:1.4rem 1.4rem 1.4rem .3rem;padding:1.1rem 1.3rem;margin-bottom:1.3rem;
 box-shadow:7px 7px 0 var(--schnabel),0 0 0 8px rgba(255,255,255,.55)}
.calc{background:linear-gradient(#fff,#d9f2ff);position:relative}
.calc::after{content:'🛁';position:absolute;right:.6rem;bottom:-1.4rem;font-size:2.6rem;transform:rotate(8deg)}
.row{display:block;font-weight:700;margin-bottom:.9rem}
.hint{font-weight:500;color:#6b5a2a}
input,select{display:block;width:100%;margin-top:.25rem;padding:.55em .8em;font:700 1.2rem 'Baloo 2',sans-serif;
 border:3px solid var(--tief);border-radius:.9rem;background:#fff;color:var(--tinte)}
button{font:400 1.25rem 'Bowlby One','Arial Black',sans-serif;background:var(--schnabel);color:#fff;border:4px solid var(--tinte);
 padding:.55em 1.3em;border-radius:3em 3em 3em .4em;cursor:pointer;box-shadow:5px 5px 0 var(--tinte);transition:transform .12s,box-shadow .12s}
button:hover{transform:translate(-2px,-2px) rotate(-1.5deg);box-shadow:8px 8px 0 var(--tinte)}
button:active{transform:translate(3px,3px);box-shadow:1px 1px 0 var(--tinte)}
.result{background:linear-gradient(135deg,#fff3a0,var(--gold));animation:plopp .5s cubic-bezier(.3,1.6,.5,1)}
@keyframes plopp{from{transform:scale(.6) rotate(-4deg);opacity:0}}
.result .big{font-size:1.5rem;font-weight:700;margin:.2em 0 .8em}
.result b{background:#fff;padding:0 .3em;border-radius:.4em;border:3px solid var(--tinte);white-space:nowrap}
dl{margin:0}dt{font-weight:700;color:var(--tief)}dd{margin:0 0 .6rem}
.formula{font-family:'Courier New',monospace;background:#fff;padding:.4em .6em;border-radius:.6em;border:2px dashed var(--tinte);overflow-x:auto}
.err{background:#ffd6d6;font-weight:700}
.text p{max-width:70ch}
aside .gold{background:linear-gradient(#fff3a0,var(--gold))}
aside .pond{background:linear-gradient(#e8f8ff,#7fd0ff)}
aside .ad{background:repeating-linear-gradient(45deg,#fff,#fff 12px,#fff0b3 12px,#fff0b3 24px);text-align:center;border-style:dotted}
.links{list-style:none;margin:0;padding:0}.links a{display:block;padding:.3em 0;color:var(--tief);font-weight:700;text-decoration:none;border-bottom:2px dotted var(--tinte)}
.links a:hover{color:var(--schnabel);padding-left:.4em}
.tip{background:#fff;border-left:6px solid var(--schnabel);padding:.4em .7em;border-radius:.4em;font-size:.95rem}
.rubber{font-size:2.2rem;animation:wackel 3s ease-in-out infinite}
footer{background:var(--tief);color:#fff;text-align:center;padding:1.3rem 1rem 1.6rem;border-top:6px double var(--gold)}
footer a{color:var(--gelb);font-weight:700}.bubbles{font-size:1.6rem;letter-spacing:.3em;margin-bottom:.4rem}
@media(max-width:820px){.wrap{grid-template-columns:1fr}.logo .crown{top:-.6em}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}