* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f4f4f5;
  color: #18181b;
}

.landing {
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.card {
  background: #fff;
  border: 1px solid #e4e4e7;
  border-radius: 12px;
  padding: 2rem;
  width: min(420px, 92vw);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.card h1 {
  margin: 0 0 0.5rem;
}

.card p {
  margin: 0 0 1.5rem;
  color: #52525b;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.join-form {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e4e4e7;
}

input[type="text"] {
  padding: 0.65rem 0.75rem;
  border: 1px solid #d4d4d8;
  border-radius: 8px;
  font-size: 1rem;
}

.btn {
  padding: 0.65rem 1rem;
  border: 1px solid #d4d4d8;
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  font-size: 0.95rem;
  text-decoration: none;
  color: inherit;
  display: inline-block;
  text-align: center;
}

.btn.primary {
  background: #18181b;
  color: #fff;
  border-color: #18181b;
}

.board-page {
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1rem;
  background: #fff;
  border-bottom: 1px solid #e4e4e7;
}

.session-id {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9rem;
  color: #52525b;
}

#canvas {
  flex: 1;
  width: 100%;
  touch-action: none;
  background: #fff;
  cursor: crosshair;
}