/* --- Base --- */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: #f6f7fb;
  color: #111827;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: 720px;
  background: #ffffff;
  border-radius: 16px;
  padding: 28px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
  border: 1px solid #e5e7eb;
  text-align: center;
}

h1 {
  margin: 0 0 16px;
  font-size: 32px;
  line-height: 1.1;
}

.sub {
  margin: 0 0 22px;
  color: #6b7280;
  font-size: 14px;
}

/* --- Button --- */
button {
  appearance: none;
  border: none;
  cursor: pointer;
  background: #16a34a;
  color: #fff;
  padding: 12px 18px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 15px;
  transition: transform 0.05s ease, opacity 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 8px 18px rgba(22, 163, 74, 0.25);
}

button:hover {
  opacity: 0.95;
}

button:active {
  transform: translateY(1px);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
}

/* --- Joke card --- */
#joke {
  margin: 22px 0 0;
  padding: 18px 16px;
  border-radius: 14px;
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  font-size: 16px;
  line-height: 1.6;
  color: #111827;
  white-space: pre-wrap;
}

/* Small screens */
@media (max-width: 420px) {
  .container {
    padding: 18px;
  }
  h1 {
    font-size: 26px;
  }
}