:root {
  --bg: #f4fbf9;
  --surface: #ffffff;
  --text: #12332f;
  --muted: #456b64;
  --accent: #0f766e;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: radial-gradient(circle at top, #d1fae5 0%, var(--bg) 55%, #ecfdf5 100%);
  color: var(--text);
  min-height: 100vh;
}
.container { max-width: 780px; margin: 0 auto; padding: 20px; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.topbar a { color: #ea580c; text-decoration: none; font-weight: 700; }
.topbar h1 { margin: 0; font-size: 2rem; }
.panel {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 10px;
  align-items: center;
  background: var(--surface);
  border: 1px solid #bae6e2;
  border-radius: 10px;
  padding: 10px;
}
.panel p { margin: 0; color: var(--muted); }
button {
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  padding: 8px 12px;
}
.word {
  margin: 18px 0;
  font-size: 2rem;
  letter-spacing: 6px;
  text-align: center;
  font-weight: 800;
}
.letters {
  display: grid;
  grid-template-columns: repeat(13, 1fr);
  gap: 8px;
}
.letter-btn {
  border: none;
  border-radius: 6px;
  background: #ccfbf1;
  color: #115e59;
  font-weight: 700;
  padding: 8px 0;
  cursor: pointer;
}
.letter-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.status { margin-top: 12px; color: var(--muted); }
@media (max-width: 760px) {
  .panel { grid-template-columns: 1fr 1fr; }
  button { grid-column: span 2; }
  .letters { grid-template-columns: repeat(8, 1fr); }
}