:root {
  --airbnb-coral: #ff385c;
  --airbnb-ink: #222222;
  --airbnb-muted: #6b6b6b;
  --airbnb-border: #ebebeb;
  --airbnb-surface: #ffffff;
  --airbnb-soft: #fff6f7;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
  font-family: 'Nunito Sans', 'Segoe UI', sans-serif;
  color: var(--airbnb-ink);
  background:
    radial-gradient(circle at 5% 5%, #ffdfe5, transparent 45%),
    radial-gradient(circle at 95% 95%, #ffecef, transparent 40%),
    #f7f7f7;
}

h1,
p,
.face,
.controls {
  width: 100%;
  max-width: 36rem;
}

h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-align: center;
  background: var(--airbnb-surface);
  border: 1px solid var(--airbnb-border);
  border-radius: 1rem;
  padding: 1rem 1.25rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

p {
  margin-top: 0.85rem;
  text-align: center;
  color: var(--airbnb-muted);
  line-height: 1.5;
  background: var(--airbnb-surface);
  border: 1px solid var(--airbnb-border);
  border-radius: 1rem;
  padding: 1rem 1.1rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
}

.face {
  margin-top: 1rem;
  background: linear-gradient(160deg, #ffffff, var(--airbnb-soft));
  border: 1px solid var(--airbnb-border);
  border-radius: 1.2rem;
  display: grid;
  place-items: center;
  font-size: 4.8rem;
  min-height: 9rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
  transition: transform 200ms ease, background-color 200ms ease;
}

.face.is-frown {
  background: linear-gradient(160deg, #ffffff, #fff1ee);
  transform: translateY(1px);
}

.controls {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

button {
  border: 1px solid var(--airbnb-border);
  border-radius: 999px;
  background: var(--airbnb-surface);
  color: var(--airbnb-ink);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  padding: 0.8rem 1rem;
  cursor: pointer;
  transition: transform 150ms ease, box-shadow 150ms ease, border-color 150ms ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
}

button:active {
  transform: translateY(0);
}

button.is-active {
  border-color: var(--airbnb-coral);
  box-shadow: 0 0 0 4px rgba(255, 56, 92, 0.15);
}

@media (max-width: 28rem) {
  body {
    padding: 0.75rem;
  }

  .controls {
    gap: 0.55rem;
  }

  button {
    padding: 0.7rem;
  }

  h1 {
    font-size: 1.75rem;
  }

  .face {
    font-size: 4rem;
  }
}