:root {
  --bg-1: #f7f4ea;
  --bg-2: #ffe8d6;
  --card: #ffffff;
  --ink: #1f2937;
  --muted: #5b6470;
  --primary: #0f766e;
  --primary-ink: #ffffff;
  --ok: #166534;
  --bad: #b91c1c;
  --line: #d7d2c7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Nunito", sans-serif;
  color: var(--ink);
  min-height: 100vh;
  background:
    radial-gradient(circle at 10% 10%, #fff7df 0%, transparent 30%),
    radial-gradient(circle at 80% 20%, #ffd8b5 0%, transparent 28%),
    linear-gradient(160deg, var(--bg-1), var(--bg-2));
}

.app {
  max-width: 680px;
  margin: 0 auto;
  padding: 20px 16px 28px;
}

.hero h1 {
  margin: 4px 0 6px;
  font-size: clamp(1.6rem, 5.2vw, 2.2rem);
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 800;
  color: #92400e;
}

.subtitle {
  margin: 0;
  color: var(--muted);
}

.card {
  margin-top: 14px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.08);
}

.grid {
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr 1fr;
}

.mode-btn,
.answer-btn,
.primary {
  border: 0;
  border-radius: 12px;
  font: inherit;
  font-weight: 800;
  padding: 14px 12px;
  min-height: 52px;
  cursor: pointer;
  touch-action: manipulation;
}

.mode-btn,
.primary {
  background: var(--primary);
  color: var(--primary-ink);
}

.topline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.question {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 8px 0 12px;
}

.answers {
  display: grid;
  gap: 10px;
}

.answer-btn {
  background: #eff6ff;
  border: 1px solid #c7d2fe;
  color: #1e3a8a;
}

.feedback {
  min-height: 24px;
  margin: 10px 0 0;
  font-weight: 700;
}

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

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

.hidden {
  display: none;
}

.start-overlay {
  text-align: center;
  padding: 1.5rem 0 0.5rem;
}

.start-hint {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 1rem;
}

@media (max-width: 520px) {
  .grid {
    grid-template-columns: 1fr;
  }
}