:root {
  --bg: #120810;
  --bg2: #1a0f18;
  --gold: #e8c547;
  --gold-dim: rgba(232, 197, 71, 0.35);
  --red: #c43b4a;
  --green: #2d6a4f;
  --text: rgba(255, 250, 245, 0.92);
  --muted: rgba(255, 245, 235, 0.62);
  --door: linear-gradient(145deg, #5c1f28, #3a1018);
  --door-open: linear-gradient(145deg, #1f4a3c, #0f2a22);
  --radius: 14px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100svh;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(232, 197, 71, 0.08), transparent 55%),
    radial-gradient(700px 400px at 10% 0%, rgba(196, 59, 74, 0.12), transparent 50%),
    linear-gradient(180deg, var(--bg), var(--bg2));
  color: var(--text);
  padding: 20px 16px 32px;
}

.skip {
  position: absolute;
  left: -999px;
  top: 12px;
  padding: 8px 12px;
  background: #000;
  color: #fff;
  border-radius: 8px;
  z-index: 100;
}
.skip:focus {
  left: 12px;
}

.top {
  max-width: 920px;
  margin: 0 auto 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

h1 {
  margin: 0;
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  letter-spacing: 0.06em;
}

.sub {
  margin: 8px 0 0;
  max-width: 52ch;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

code {
  font-size: 0.85em;
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.demoToggle {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}

.hint {
  max-width: 920px;
  margin: 0 auto 14px;
  font-size: 0.88rem;
  color: var(--gold);
  min-height: 1.4em;
}

.grid {
  max-width: 920px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(104px, 1fr));
  gap: 12px;
}

.door {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font: inherit;
  font-weight: 800;
  font-size: 1.35rem;
  color: #fff8e8;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.45);
  background: var(--door);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.08) inset,
    0 12px 28px rgba(0, 0, 0, 0.35);
  transition: transform 0.22s ease, box-shadow 0.22s ease, filter 0.22s ease;
}
.door:active:not(:disabled) {
  transform: translateY(-1px) scale(0.98);
}

.door:hover:not(:disabled) {
  transform: translateY(-3px) scale(1.02);
  box-shadow:
    0 0 0 1px rgba(232, 197, 71, 0.35) inset,
    0 18px 40px rgba(0, 0, 0, 0.4);
}

.door:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  filter: grayscale(0.3);
}

.door.is-open {
  background: var(--door-open);
  color: rgba(255, 255, 255, 0.95);
  font-size: 0.72rem;
  line-height: 1.25;
  padding: 8px;
  cursor: default;
}

.door.is-open:hover {
  transform: none;
}

.door.is-peek {
  outline: 2px dashed var(--gold-dim);
}

.doorRipple {
  position: absolute;
  width: 12px;
  height: 12px;
  margin: -6px 0 0 -6px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 248, 220, 0.75), rgba(232, 197, 71, 0.4) 42%, transparent 70%);
  transform: scale(0);
  pointer-events: none;
  z-index: 1;
}
.doorRipple.go {
  animation: doorRipple 0.58s ease-out forwards;
}
@keyframes doorRipple {
  to {
    transform: scale(18);
    opacity: 0;
  }
}
.doorRipple--muted {
  background: radial-gradient(circle, rgba(255, 200, 200, 0.55), rgba(196, 59, 74, 0.25) 50%, transparent 72%);
}
.door--openflash {
  animation: doorOpenFlash 0.55s ease-out;
}
@keyframes doorOpenFlash {
  0% {
    filter: brightness(1.65) saturate(1.15);
    box-shadow:
      0 0 0 2px rgba(232, 197, 71, 0.75) inset,
      0 0 40px rgba(232, 197, 71, 0.45);
  }
  100% {
    filter: none;
    box-shadow:
      0 0 0 1px rgba(255, 255, 255, 0.08) inset,
      0 12px 28px rgba(0, 0, 0, 0.35);
  }
}

.foot {
  max-width: 920px;
  margin: 28px auto 0;
  font-size: 0.85rem;
}
.foot a {
  color: rgba(255, 210, 160, 0.95);
}

/* Schnee — nur wenn keine reduced motion */
.snow {
  pointer-events: none;
  position: fixed;
  inset: 0;
  overflow: hidden;
  z-index: 0;
}
.snow span {
  position: absolute;
  top: -12px;
  color: rgba(255, 255, 255, 0.55);
  font-size: 10px;
  animation: fall linear infinite;
}
@keyframes fall {
  to {
    transform: translateY(110vh);
  }
}

@media (prefers-reduced-motion: reduce) {
  .snow {
    display: none;
  }
  .door {
    transition: none;
  }
  .door:active:not(:disabled) {
    transform: none;
  }
  .btn:active {
    transform: none;
  }
  .doorRipple.go,
  .door--openflash {
    animation: none !important;
  }
  .modal__panel--in {
    animation: none !important;
  }
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 16px;
}
.modal[hidden] {
  display: none;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(6px);
}

.modal__panel {
  position: relative;
  width: min(420px, 100%);
  padding: 24px 22px 22px;
  border-radius: 18px;
  border: 1px solid rgba(255, 220, 180, 0.2);
  background: linear-gradient(165deg, rgba(40, 24, 32, 0.98), rgba(18, 10, 14, 0.98));
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.55);
  transform-origin: 50% 40%;
}
.modal__panel--in {
  animation: modalIn 0.38s cubic-bezier(0.22, 1, 0.36, 1) both;
}
@keyframes modalIn {
  0% {
    opacity: 0;
    transform: translateY(16px) scale(0.94);
    filter: blur(4px);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: none;
  }
}

.modal__x {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(0, 0, 0, 0.35);
  color: #fff;
  font-size: 22px;
  cursor: pointer;
}

.modal__kicker {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.modal__panel h2 {
  margin: 10px 0 0;
  font-size: 1.2rem;
}

.modal__body {
  margin: 14px 0 18px;
  color: var(--muted);
  line-height: 1.65;
  font-size: 0.95rem;
}

.btn {
  font: inherit;
  cursor: pointer;
  border-radius: 12px;
  border: 1px solid rgba(232, 197, 71, 0.45);
  background: linear-gradient(135deg, #e8c547, #b8922a);
  color: #1a1208;
  padding: 10px 20px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.72rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.12s ease, filter 0.2s ease, box-shadow 0.2s ease;
}
.btn:hover {
  filter: brightness(1.06);
  box-shadow: 0 0 24px rgba(232, 197, 71, 0.35);
}
.btn:active {
  transform: scale(0.97);
}