:root {
  --bg-a: #f9f4ea;
  --bg-b: #dbe8ff;
  --ink: #112036;
  --ink-soft: #314562;
  --line: #1a27411f;
  --card: #ffffffcc;
  --accent: #ff6a3d;
  --accent-2: #009d8f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--ink);
  background: radial-gradient(120% 90% at 0% 0%, #fff7df 0%, transparent 55%),
    radial-gradient(120% 90% at 100% 100%, #cbe6ff 0%, transparent 60%),
    linear-gradient(140deg, var(--bg-a), var(--bg-b));
  display: grid;
  place-items: center;
  padding: 24px;
}

.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: radial-gradient(circle at center, black 40%, transparent 85%);
}

.shell {
  width: min(780px, 100%);
  display: grid;
  gap: 16px;
  animation: rise 500ms ease;
}

.panel,
.hero {
  backdrop-filter: blur(6px);
  background: var(--card);
  border: 1px solid #ffffff;
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 10px 35px #10234121;
}

.kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent-2);
  font-size: 0.72rem;
  font-weight: 700;
}

h1 {
  margin: 8px 0;
  font-size: clamp(1.7rem, 3.6vw, 2.8rem);
  line-height: 1.05;
}

.lead {
  margin: 0;
  color: var(--ink-soft);
}

.challenge {
  display: grid;
  gap: 12px;
}

.challenge label {
  font-weight: 600;
}

.challenge input {
  width: 100%;
  border-radius: 12px;
  border: 1px solid #cad8ee;
  padding: 12px;
  font-family: "Chivo Mono", Consolas, monospace;
  font-size: 0.95rem;
}

.actions {
  display: flex;
  gap: 10px;
}

button {
  border: 0;
  background: linear-gradient(130deg, var(--accent), #ff9152);
  color: #fff;
  font-weight: 700;
  border-radius: 12px;
  padding: 9px 14px;
  cursor: pointer;
  transition: transform 140ms ease, filter 140ms ease;
}

button:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
}

button.ghost {
  background: #fff;
  color: var(--ink);
  border: 1px solid #dde5f3;
}

#status {
  margin: 0;
  padding: 14px;
  border-radius: 12px;
  background: #0f1d2a;
  color: #d8f0ff;
  min-height: 56px;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: "Chivo Mono", Consolas, monospace;
}

@media (max-width: 640px) {
  body {
    padding: 14px;
  }

  .hero,
  .panel {
    padding: 16px;
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}