@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600&family=Space+Grotesk:wght@400;600;700&display=swap');

:root {
  color-scheme: light;
  --bg: #0c0f14;
  --bg-accent: #131a23;
  --panel: #0f141c;
  --panel-glow: rgba(96, 165, 250, 0.15);
  --text: #e6ecf4;
  --muted: #9aa6b2;
  --accent: #64c2ff;
  --accent-2: #ffd166;
  --danger: #ff7b7b;
  --success: #7dffb2;
  --shadow: rgba(2, 6, 23, 0.7);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Space Grotesk', 'Segoe UI', sans-serif;
  background: radial-gradient(circle at top, rgba(100, 194, 255, 0.18), transparent 55%),
    linear-gradient(150deg, #0c0f14 0%, #0b1220 45%, #0b0f18 100%);
  color: var(--text);
  min-height: 100vh;
  padding: 10px;
}

.layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.panel {
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.03), transparent 60%),
    var(--panel);
  border-radius: var(--radius);
  border: 1px solid rgba(148, 163, 184, 0.14);
  box-shadow: 0 12px 24px var(--shadow);
  padding: 10px;
  position: relative;
  overflow: hidden;
}

.code {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  background: rgba(7, 10, 15, 0.7);
  padding: 14px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.12);
  white-space: pre-wrap;
  word-break: break-word;
}

.choices__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 10px;
}

.choice {
  display: grid;
  gap: 6px;
  text-align: left;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 16px;
  padding: 10px;
  color: inherit;
  cursor: pointer;
  transition: transform 0.2s ease, border 0.2s ease, box-shadow 0.2s ease;
}

.choice:hover {
  transform: translateY(-2px);
  border-color: rgba(100, 194, 255, 0.6);
  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.4);
}

.choice.is-selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(100, 194, 255, 0.25);
}

.choice.is-correct {
  border-color: var(--success);
  box-shadow: 0 0 0 2px rgba(125, 255, 178, 0.25);
}

.choice.is-incorrect {
  border-color: var(--danger);
  box-shadow: 0 0 0 2px rgba(255, 123, 123, 0.25);
}

.feedback {
  margin-top: 8px;
  font-weight: 600;
  min-height: 24px;
}

.feedback.success {
  color: var(--success);
}

.feedback.error {
  color: var(--danger);
}

button {
  font-family: inherit;
  border: none;
  border-radius: 999px;
  padding: 8px 14px;
  font-weight: 600;
  cursor: pointer;
}

button.primary {
  background: linear-gradient(120deg, #64c2ff, #4ade80);
  color: #051014;
  box-shadow: 0 12px 30px rgba(100, 194, 255, 0.35);
}

button.primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#submit {
  margin: 0;
}

.submit-row {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  margin-top: 8px;
}

button.ghost {
  background: rgba(148, 163, 184, 0.1);
  color: var(--text);
  border: 1px solid rgba(148, 163, 184, 0.2);
}

@media (min-width: 900px) {
  .layout {
    grid-template-columns: 1.1fr 1.3fr;
    align-items: start;
  }

  .disasm {
    position: sticky;
    top: 24px;
  }
}

@media (max-width: 600px) {
  body {
    padding: 8px;
  }
}