* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, Arial, sans-serif;
  background: #f6f1e8;
  color: #222;
}

.app {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
}

.app > h1,
.app > .subtitle {
  flex: 0 0 100%;
}

.card {
  flex: 1 1 320px;
  min-width: 280px;
  max-width: 420px;
}

h1 {
  text-align: center;
  font-size: 3rem;
  margin-bottom: 0;
}

.subtitle {
  text-align: center;
  margin-top: 4px;
  color: #666;
}

.card {
  background: white;
  border: 2px solid #222;
  border-radius: 16px;
  padding: 20px;
  margin-top: 20px;
  box-shadow: 5px 5px 0 #222;
}

label {
  display: block;
  margin: 12px 0;
  font-weight: 600;
}

input {
  width: 100%;
  padding: 12px;
  margin-top: 6px;
  border: 2px solid #222;
  border-radius: 10px;
  font-size: 1rem;
}

button {
  width: 100%;
  padding: 14px;
  margin-top: 12px;
  border: 2px solid #222;
  border-radius: 10px;
  background: #ffd166;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  filter: brightness(0.96);
}

.hidden {
  display: none;
}

.room-code {
  font-size: 3rem;
  font-weight: 800;
  text-align: center;
  letter-spacing: 6px;
  background: #efefef;
  padding: 16px;
  border-radius: 12px;
}

.secret-card {
  margin-top: 20px;
  padding: 20px;
  background: #e6f4ff;
  border: 2px dashed #222;
  border-radius: 16px;
  text-align: center;
}

.secret-card h2 {
  font-size: 3rem;
}

.site-footer {
  flex: 0 0 100%;
  background: #222;
  color: #f6f1e8;
  border: 2px solid #222;
  border-radius: 16px;
  padding: 20px;
  margin-top: 20px;
  text-align: center;
}

.site-footer p {
  margin: 0.4rem 0;
  font-size: 0.95rem;
}

.site-footer .disclaimer {
  color: #ffd166;
  font-weight: 700;
}