:root{
  --primary:#b30000;
  --bg:#fff8f4;
  --text:#1f2937;
  --muted:#6b7280;
  --card:#ffffff;
  --border:#e5e7eb;
  --font: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, 'Helvetica Neue', Arial;
  --font-size: 16px;
  --font-color: var(--text);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--font-color);font-family:var(--font);font-size:var(--font-size);}
.container{max-width:1100px;margin:0 auto;padding:24px}
.header{display:flex;gap:16px;align-items:center;justify-content:space-between;margin-bottom:24px;flex-wrap:wrap}
.brand{display:flex;gap:12px;align-items:center}
.brand img.logo{height:48px;width:auto;border-radius:8px}
.brand .title{font-size:24px;font-weight:700;color:var(--primary)}
.subtitle{font-size:14px;color:var(--muted)}
.nav{display:flex;gap:12px;flex-wrap:wrap}
.nav a{padding:8px 12px;border:1px solid var(--border);border-radius:10px;background:var(--card);text-decoration:none;color:inherit}
.nav a:hover{border-color:var(--primary);color:var(--primary)}
.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
@media(min-width:520px){.grid{grid-template-columns:repeat(4,1fr)}}
@media(min-width:900px){.grid{grid-template-columns:repeat(6,1fr)}}
.window{position:relative;aspect-ratio:1/1;border-radius:14px;overflow:hidden;border:1px solid var(--border);background:linear-gradient(135deg,#fff,#f5f5f5)}
.window.locked{filter:grayscale(1);opacity:.6}
.window a{display:block;width:100%;height:100%;text-decoration:none;color:inherit}
.window .num{position:absolute;top:8px;left:8px;background:var(--primary);color:#fff;padding:6px 10px;border-radius:999px;font-weight:700;font-size:12px;z-index:2}
.window .badge{position:absolute;top:8px;right:8px;background:#111827;color:#fff;padding:6px 10px;border-radius:999px;font-weight:600;font-size:12px;z-index:2;opacity:.85}
.window .thumb{width:100%;height:100%;object-fit:cover;display:block}
.window .title{position:absolute;bottom:0;left:0;right:0;background:linear-gradient(180deg,transparent,rgba(0,0,0,.6));color:#fff;padding:10px 12px;font-size:14px}
.footer{margin-top:32px;padding:16px;border-top:1px solid var(--border);color:var(--muted);font-size:12px}
.btn{display:inline-block;padding:10px 14px;border-radius:10px;border:1px solid var(--border);background:var(--card);text-decoration:none;color:inherit;cursor:pointer}
.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}
.btn.muted{background:#f3f4f6}
.alert{padding:12px 14px;border:1px solid var(--border);border-radius:12px;background:#fff}
.content{background:var(--card);padding:18px;border-radius:14px;border:1px solid var(--border)}
.hero{background:#fff; padding:20px;border-radius:14px;border:1px solid var(--border);margin-bottom:16px}
img.responsive{max-width:100%;height:auto;border-radius:12px}
.small{font-size:12px;color:var(--muted)}
.quiz{display:grid;gap:10px;margin-top:12px}
.quiz .opt{padding:10px;border:1px solid var(--border);border-radius:10px;cursor:pointer}
.quiz .opt.sel{outline:2px solid var(--primary)}
.quiz .result{margin-top:8px;font-weight:600}
.audio-toggle{display:flex;align-items:center;gap:8px}
canvas#snow{position:fixed;left:0;top:0;width:100%;height:100%;pointer-events:none;z-index:999}


/* --- Advent: Aufgeh-Effekt für Türchen --- */
.window { perspective: 1000px; }
.window a { position: relative; overflow: hidden; }
/* Die "Tür" liegt obenauf und klappt nach links auf */
.window a .door {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 50%, rgba(0,0,0,.15) 0 10px, transparent 11px),
    linear-gradient(135deg, rgba(255,255,255,.15), rgba(0,0,0,.05)),
    #9b1c1c;
  transform-origin: left center;
  transform: rotateY(0deg);
  transition: transform .6s ease;
  border-right: 2px solid rgba(0,0,0,.25);
  z-index: 3;
}
.window a .door::after {
  content: "";
  position: absolute;
  right: 14px;
  top: 50%;
  width: 10px;
  height: 10px;
  margin-top: -5px;
  border-radius: 50%;
  background: rgba(255,255,255,.9);
  box-shadow: 0 0 0 3px rgba(0,0,0,.08) inset;
}
.window.opening a .door { transform: rotateY(-100deg); }
@media (hover:hover) {
  .window:not(.locked) a:hover .door { filter: brightness(1.03); }
}
@media (prefers-reduced-motion: reduce) {
  .window a .door { transition: none; }
}