* {
  box-sizing: border-box;
}

:root {
  --bg-dark: #080716;
  --panel: rgba(13, 12, 33, 0.82);
  --panel-strong: rgba(20, 18, 50, 0.95);
  --text: #f8f7ff;
  --muted: #c7c2ff;
  --pink: #ff4fd8;
  --purple: #8f5cff;
  --cyan: #35e7ff;
  --lime: #a8ff60;
  --yellow: #ffe66d;
  --danger: #ff5c7a;
}

body {
  margin: 0;
  font-family: Menlo, Monaco, Consolas, "Courier New", monospace;
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 20% 20%, rgba(255, 79, 216, 0.35), transparent 28%),
    radial-gradient(circle at 80% 10%, rgba(53, 231, 255, 0.32), transparent 26%),
    radial-gradient(circle at 50% 95%, rgba(168, 255, 96, 0.22), transparent 35%),
    linear-gradient(135deg, #09051f 0%, #171044 45%, #061826 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, transparent, black 18%, black 82%, transparent);
}

body::after {
  content: "₿  SHA-256  HASH  NONCE  MEMPOOL  BLOCK";
  position: fixed;
  left: -10%;
  bottom: 8%;
  width: 120%;
  pointer-events: none;
  color: rgba(255, 255, 255, 0.08);
  font-size: clamp(2rem, 8vw, 7rem);
  font-weight: 900;
  letter-spacing: 0.18em;
  transform: rotate(-8deg);
  white-space: nowrap;
}

.app {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  position: relative;
  z-index: 1;
}

.card {
  width: min(760px, 100%);
  border: 1px solid rgba(255, 255, 255, 0.24);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.12), transparent),
    var(--panel);
  backdrop-filter: blur(18px);
  box-shadow:
    0 0 55px rgba(255, 79, 216, 0.24),
    0 0 80px rgba(53, 231, 255, 0.16),
    inset 0 0 0 1px rgba(255,255,255,0.08);
  border-radius: 28px;
  padding: 34px;
}

.eyebrow {
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 0.24em;
  font-size: 0.78rem;
  text-shadow: 0 0 18px rgba(53, 231, 255, 0.8);
}

h1 {
  margin: 0;
  font-size: clamp(2.1rem, 6vw, 4.3rem);
  line-height: 1;
  background: linear-gradient(90deg, var(--yellow), var(--pink), var(--cyan), var(--lime));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle {
  color: var(--muted);
  line-height: 1.6;
  font-size: 1rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 26px 0;
}

.stats div {
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 18px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 0 18px rgba(255,255,255,0.04);
}

.stats span {
  color: var(--lime);
  text-shadow: 0 0 14px rgba(168, 255, 96, 0.75);
}

.clue-box {
  border: 1px solid rgba(53, 231, 255, 0.35);
  border-left: 5px solid var(--cyan);
  background:
    linear-gradient(90deg, rgba(53, 231, 255, 0.14), rgba(255, 79, 216, 0.08)),
    rgba(5, 5, 20, 0.62);
  padding: 20px;
  margin-bottom: 22px;
  border-radius: 18px;
  box-shadow: 0 0 24px rgba(53, 231, 255, 0.14);
}

.choices {
  display: grid;
  gap: 13px;
}

.choice {
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background:
    linear-gradient(135deg, rgba(255, 79, 216, 0.16), rgba(53, 231, 255, 0.08)),
    rgba(255, 255, 255, 0.07);
  color: var(--text);
  padding: 17px;
  border-radius: 18px;
  font: inherit;
  text-align: left;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.choice:hover {
  transform: translateY(-3px);
  border-color: var(--pink);
  box-shadow:
    0 0 22px rgba(255, 79, 216, 0.35),
    0 0 28px rgba(53, 231, 255, 0.16);
}

.choice:disabled {
  cursor: not-allowed;
  opacity: 0.7;
  transform: none;
}

.result {
  min-height: 30px;
  font-weight: 800;
  color: var(--yellow);
  text-shadow: 0 0 15px rgba(255, 230, 109, 0.55);
}

button {
  cursor: pointer;
  border: 0;
  background: linear-gradient(90deg, var(--pink), var(--purple), var(--cyan));
  color: #080716;
  padding: 15px 20px;
  border-radius: 18px;
  font: inherit;
  font-weight: 900;
  margin-right: 8px;
  box-shadow: 0 0 24px rgba(255, 79, 216, 0.25);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

button:hover {
  transform: translateY(-2px);
  box-shadow:
    0 0 28px rgba(255, 79, 216, 0.45),
    0 0 35px rgba(53, 231, 255, 0.24);
}

.hidden {
  display: none;
}

@media (max-width: 560px) {
  .card {
    padding: 22px;
  }

  .stats {
    grid-template-columns: 1fr;
  }

  body::after {
    display: none;
  }
}