:root {
  --bg-1: #081c15;
  --bg-2: #1b4332;
  --panel: rgba(216, 243, 220, 0.12);
  --panel-border: rgba(216, 243, 220, 0.35);
  --text: #f1faee;
  --muted: #cde6d0;
  --accent: #95d5b2;
  --accent-2: #74c69d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  background: radial-gradient(circle at top right, #2d6a4f 0%, var(--bg-2) 35%, var(--bg-1) 100%);
  display: grid;
  place-items: center;
  padding: 20px;
}

.app {
  width: min(680px, 100%);
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.8rem);
  letter-spacing: 0.02em;
}

header p {
  margin: 8px 0 20px;
  color: var(--muted);
}

.card {
  backdrop-filter: blur(6px);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  padding: 18px;
  display: grid;
  gap: 12px;
}

label {
  font-weight: 600;
}

select,
button,
audio {
  width: 100%;
}

select,
button {
  border: 1px solid rgba(241, 250, 238, 0.25);
  border-radius: 10px;
  padding: 10px;
  font: inherit;
}

select {
  background: rgba(0, 0, 0, 0.2);
  color: var(--text);
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

button {
  cursor: pointer;
  color: #052e16;
  font-weight: 700;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
}

button:hover {
  filter: brightness(1.05);
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 700px) {
  .buttons {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .buttons {
    grid-template-columns: 1fr;
  }
}