* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f6f8;
  color: #1f2937;
}

.page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.card {
  width: 100%;
  max-width: 440px;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 24px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
}

h1 {
  margin: 0 0 8px;
  font-size: 24px;
}

.subtext {
  margin: 0 0 18px;
  color: #4b5563;
}

.invite-banner {
  margin: 0 0 12px;
  padding: 8px 10px;
  border: 1px solid #93c5fd;
  border-radius: 6px;
  background: #eff6ff;
  color: #1e3a8a;
  font-size: 13px;
}

.form {
  display: grid;
  gap: 10px;
}

label {
  font-size: 14px;
  font-weight: 600;
}

input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  font-size: 14px;
}

button {
  border: 0;
  border-radius: 6px;
  padding: 10px 12px;
  font-size: 14px;
  cursor: pointer;
}

#login-btn {
  margin-top: 4px;
  background: #2563eb;
  color: #fff;
}

.session-tools {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

#check-session-btn {
  background: #e5e7eb;
  color: #111827;
}

#logout-btn {
  background: #ef4444;
  color: #fff;
}

.status-box {
  margin-top: 12px;
  min-height: 44px;
  padding: 10px;
  border-radius: 6px;
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  font-size: 13px;
  white-space: pre-wrap;
}

.hint {
  margin-top: 10px;
  font-size: 12px;
  color: #6b7280;
}